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    • Posted by Dharmendra Singh Rathod 3 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 3 years, 11 months ago

    • Mendel's Laws of Inheritance.
    • Inheritance of One Gene.
    • Law of Dominance.
    • Law of Segregation.
    • Inheritance of Two Genes.

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    • Posted by Manshi Singh 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Ansh Singh 3 years, 11 months ago

    Vagaina

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    • Posted by Priya Sharma 3 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 3 years, 11 months ago

    Both A and R are true but R is not the correct explanation of A.

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    • Posted by Lamlalawi Gangte 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 3 answers

    Sia ? 4 years, 1 month ago

    The embryo enters the uterus at the stage of the blastocyst and becomes attached to the wall of the uterus, where it is to perform its subsequent development. This attachment of the blastocyst to the uterine wall is known as implantation.

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    Devika Tiwari 4 years ago

    A process in which a developing embryo moving as blastocysts through a uterus.

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    Mayank Kumar Mks 4 years, 1 month ago

    Placenta

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    • Posted by Neha Pathak 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 5 answers

    Magdalin Felicita 4 years, 1 month ago

    Solanum tuberosum

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    Sher Singh 4 years, 1 month ago

    Solanum tuberosum

    3Thank You

    Vighnesh Phulsure 4 years, 1 month ago

    Solanum tuberosum the scientific name of potato is

    3Thank You

    Hari Nishad 4 years, 1 month ago

    Solanum tuberosum

    4Thank You

    Neha Pathak 4 years, 1 month ago

    Solanum tuberosum

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 2 answers

    Sia ? 4 years, 1 month ago

    “Polygenic inheritance is defined as quantitative inheritance, where multiple independent genes have an additive or similar effect on a single quantitative trait.”

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    Devika Tiwari 4 years ago

    Polygenic inheritance occurs when one characteristics of an organisms is controlled by two or more genes .

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 2 answers

    Sia ? 4 years, 1 month ago

    Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.

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    Roshani Rani 4 years ago

    In the case of co-dominance the both parents character show or dominant in offspring. A good example for co-dominance :- If in one parent have 'A' blood group and in other parent have 'B' blood group then offspring have AB blood group that means show or dominant both parents character in offspring.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Incomplete dominance occurs in the heterozygote, in which the dominant allele does not dominate the recessive allele entirely; rather, an intermediate trait appears in the offspring. Codominance occurs when the alleles do not show any dominant and recessive allele relationship.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Mendel proposed the laws of inheritance. The law of dominance states that whenever the dominant allele is present, the dominant allele will express itself. The expression of the recessive allele is suppressed in the presence of dominant allele. The recessive allele does not get lost. The expression remains masked in the progenies of F1​ generation and reappears in the next generation. For example, when pea plants with round seeds (RR) are crossed with plants with wrinkled seeds (rr), all seeds in F1​ generation were found to be round (Rr). When these round seeds were self-fertilised, both the round and wrinkled seeds appeared in F2​ generation in 3: 1 ratio.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

     

    Test cross is a cross between an organism with unknown genotype and a recessive parent. It is used to determine whether an individual is homozygous or heterozygous for a trait.

    Example:

    • Suppose you have a violet and white flower and violet color (P) is dominant to white (p). The white flower must be homozygous for the recessive allele, but the genotype of the violet flower is unknown. It could be either PP or Pp.
    • A testcross will determine the organism's genotype. The unknown genotype can be determined by observing the phenotypes of the resulting offspring.
    • If crossing the unknown dominant phenotype (PP or Pp genotype) individual with the recessive phenotype individual produces only dominant phenotypes (no recessive), then the unknown individual is homozygous dominant.
    • If any recessive phenotypic individuals result from the cross, then the unknown individual must carry the recessive allele, and have the heterozygous genotype.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Inheritance can be defined as the process of how a child receives genetic information from the parent. The whole process of heredity is dependent upon inheritance and it is the reason that the offsprings are similar to the parents. This simply means that due to inheritance, the members of the same family possess similar characteristics.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Mohan Kumar 4 years, 1 month ago

    Mendel crossed pure lines of pea plants. Dominant traits, like purple flower colour, appeared in the first-generation hybrids (F1), whereas recessive traits, like white flower colour, were masked. However, recessive traits reappeared in second-generation (F2) pea plants in a ratio of 3:1 (dominant to recessive).

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Thalassemia is an inherited blood disorder in which the body makes an abnormal form of hemoglobin. Hemoglobin is the protein molecule in red blood cells that carries oxygen. The disorder results in excessive destruction of red blood cells, which leads to anemia.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Color blindness is an abnormal condition characterized by the inability to clearly distinguish different colors of the spectrum. The difficulties can range from mild to severe. It is a misleading term because people with color blindness are not blind.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    In honey bees, the male is haploid while the female is diploid. Haplodiploidy occurs in some insects like bees, ants and wasps. Male insects are haploid because they develop partheno-genetically from unfertilized eggs. The phenomenon is called arehenotoky. Meiosis does not occur during the formation of sperms. Females grow from fertilized eggs and are hence diploid. Queen bee picks up all the sperms from the drone during nuptial flight and stores the same in her seminal vesicle. Formation of worker bees(diploid females) and drones(haploid males) depends upon the brood cells visited by the queen. While visiting the smaller brood cells, the queen emits sperms from its seminal receptacle after laying the eggs. Males are normally fertile haploids due to development from unfertilized eggs. Occasionally diploid infertile males are also produced from heterozygous females through fertilization.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Turner syndrome is a rare genetic disorder that’s found only in girls. It can cause problems ranging from short height to heart defects. Sometimes, the symptoms are so mild that it doesn’t get diagnosed until a female is a teen or young adult.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Klinefelter's syndrome isn't inherited, but rather occurs only as a result of a random genetic error after conception.

    Males born with Klinefelter's syndrome may have low testosterone and reduced muscle mass, facial hair and body hair. Most males with this condition produce little or no sperm.

    Treatment may include testosterone replacement and fertility treatment.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Down's syndrome is a genetic disorder caused when abnormal cell division results in extra genetic material from chromosome 21.

    Down's syndrome causes a distinct facial appearance, intellectual disability and developmental delays. It may be associated with thyroid or heart disease.

    Early intervention programmes with a team of therapists and special educators who can treat each child's specific situation are helpful in managing Down's syndrome.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    A genetic disorder is a disease that is caused by a change, or mutation, in an individual's DNA sequence. A genetic disorder is an illness caused by changes in a person's DNA.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Aneuploidy is defined as any deviation from the normal number of chromosomes, usually meaning a cell nucleus possessing too many or too few chromosomes.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Euploidy is a chromosomal variation that involves the entire set of chromosomes in a cell or an organism. Other types of euploidy are autopolyploidy and allopolyploidy. In autopolyploidy, there is an additional set of chromosomes, which may be from a parent or identical parental species (i.e. a single taxon).

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Polyploidy is a condition in which the cells of an organism have more than two paired sets of chromosomes. Most species whose cells have nuclei are diploid, meaning they have two sets of chromosomes—one set inherited from each parent.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 0 answers
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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Ploidy is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Sets of chromosomes refer to the number of maternal and paternal chromosome copies, respectively, in each homologous chromosome pair, which chromosomes naturally exist as.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Ploidy is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Sets of chromosomes refer to the number of maternal and paternal chromosome copies, respectively, in each homologous chromosome pair, which chromosomes naturally exist as.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Point mutation is the mutation that affects a single nucleotide or nucleic acid. It commonly occurs when one base is substituted for the other. It may also result due to insertion and deletion of a single base pair. 

    Examples of point mutation are:

    • Cystic fibrosis: It occurs due to the deletion of three nucleotides in the CFTR gene. In this, an amino acid phenylalanine is lost which causes misfolding of protein.
    • Sickle cell anemia: It is caused by single point mutation in the beta haemoglobin gene. This results in the conversion of GAG codon into GUG that encodes amino acid valine.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 2 answers

    Sia ? 4 years, 1 month ago

    In biology, a mutation is an alteration in the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA. Viral genomes contain either DNA or RNA. Mutation is the ultimate source of all genetic variation, providing the raw material on which evolutionary forces such as natural selection can act.

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    Deepanshu Yadav 4 years ago

    Means suddenly mutuation in DNA sequence mutation means mute hona

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Pedigree analysis is the study of a particular trait that is inherited from one generation to another. During these days in many cases, including various species of plant and animal, scientists are using the pedigree analysis to analyze the inheritance of phenotypes, or traits, using mating experiments called crosses.
    Pedigree analysis is like a chart that represents a family tree, which displays the members of the family who are affected by a genetic trait or having a genetic disorder or maybe carrier of the disease.
    In the family tree, the rows represent the generations of a family, squares represent the males and circles represent the females.
    The pedigree analysis helps to know the trait of inheritance for a particular trait, and also know whether the trait is getting inherited or not.

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    • Posted by Mahek Patel 4 years, 1 month ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 4 years, 1 month ago

    Normally, cells from females contain two X chromosomes, and cells from males contain an X and a Y chromosome. Occasionally, individuals are born with *** chromosome aneuploidies, and the *** of these individuals is always determined by the absence or presence of a Y chromosome.

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    • Posted by Mahek Patel 3 years, 11 months ago

    CBSE > Class 12 > Biology
    • 0 answers
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