Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Geeta Devi 7 years ago
- 1 answers
Posted by Aanchal Sachdeva 7 years ago
- 2 answers
Posted by Shreya Singh 7 years ago
- 1 answers
Posted by Priya Sinha 7 years ago
- 2 answers
A Jaiswal 7 years ago
Ashu Rathore 7 years ago
Posted by Kunal Sagar 7 years ago
- 1 answers
Posted by Babulal Bairwa 7 years ago
- 1 answers
Yogita Ingle 7 years ago
Polymerase chain reaction (PCR) is a technique in molecular biology to amplify a gene or a piece of DNA to obtain its several copies. It is extensively used in the process of gene manipulation. The process involves in-vitro synthesis of sequences using a primer, a template strand, and a thermostable DNA polymerase enzyme obtained from a bacterium, called Thermus aquaticus. The enzyme utilizes building blocks dNTPs (deoxynucleotides) to extend the primer. In the first step, the double stranded DNA molecules are heated to a high temperature so that the two strands separate into a single stranded DNA molecule. This process is called denaturation. Then, this ssDNA molecule is used as a template strand for the synthesis of a new strand by the DNA polymerase enzyme and this process is called annealing, which results in the duplication of the original DNA molecule. This process is repeated over several cycles to obtain multiple copies of the rDNA fragment.
Posted by Aarti Khera 7 years ago
- 2 answers
Posted by Lovelesh Karhana 7 years ago
- 0 answers
Posted by Pratik Pawar 7 years ago
- 0 answers
Posted by Manish Verma 7 years ago
- 2 answers
Posted by Manish Verma 7 years ago
- 2 answers
Aanchal Sachdeva 7 years ago
Posted by Aayat Shaikh 7 years ago
- 2 answers
Arjit Srivastav 7 years ago
Ashu Rathore 7 years ago
Posted by Rashid Qureshi 7 years ago
- 1 answers
Gaurav Seth 7 years ago
Haemophilia is categorised as Mendelian disorders because they occur by mutation in a single gene. Its mode of inheritance follows the principles of Mendelian genetics. Mendelian disorders can be
- autosomal dominant (muscular dystrophy)
- autosomal recessive (thalassaemia)
- *** linked (haemophilia)
Symptoms of Haemophilia
- Person suffering from this disease does not develop a proper blood clotting mechanism.
- A haemophilic patient suffers from non-stop bleeding even on a simple cut, which may lead to death.
Pattern of Inheritance of Haemophilia:
Haemophilia is an X-linked genetic disorder. Compared to females, males have higher chances of getting affected because females have XX chromosomes while males have only one X with Y chromosome. Thus, for a female to get affected by haemophilia, she has to have the mutant gene on both the X chromosomes while males can be affected if they carry it on the single X chromosome.
Conditions for haemophilia:
XY; XX: Normal
XhY: Haemophilic
XhX: Carrier
XhXh: Haemophilic
Let us assume that a carrier female (XhX) is married to a normal male.
|
Parents |
|
XY |
x |
XhX |
|
Offspring |
XhX |
XX |
|
XY |
|
Parents |
|
XY |
x |
XhX |
|
Offspring |
XhX |
XX |
|
XY |
Posted by Shariq Ansari 7 years ago
- 1 answers
Meghna Thapar 5 years, 8 months ago
Cro-Magnons were anatomically modern, straight limbed and tall compared to the contemporaneous Neanderthals. They are thought to have stood on average 1.66 to 1.71 m tall. They differ from modern-day humans in having a more robust physique and a slightly larger cranial capacity. Cro-Magnons were the first humans (genus Homo) to have a prominent chin. The brain capacity was about 1,600 cc (100 cubic inches), somewhat larger than the average for modern humans. It is thought that Cro-Magnons were probably fairly tall compared with other early human species.
Posted by Dhami Jii 7 years ago
- 1 answers
Khushi Goyal 7 years ago
Posted by Mausam Yadav 7 years ago
- 1 answers
Meghna Thapar 5 years, 8 months ago
A niche in the market is a specific area of marketing which has its own particular requirements, customers, and products. Niche marketing is the practice of dividing the market into specialized areas for which particular products are made. A niche market is one of these specialized areas. For example, a garden spider is a predator that hunts for prey among plants, while an oak tree grows to dominate a forest canopy, turning sunlight into food. The role that a species plays is called its ecological niche. A niche includes more than what an organism eats or where it lives.
Posted by Sabia Taqi 7 years ago
- 1 answers
Aanchal Sachdeva 7 years ago
Posted by Sabia Taqi 7 years ago
- 1 answers
Posted by Saveksha Kadian 7 years ago
- 4 answers
Posted by Kartik Saini 7 years ago
- 1 answers
Kartik Mittal 7 years ago
Posted by Ashu Rathore 7 years ago
- 2 answers
Yogita Ingle 7 years ago
Mediterranean orchid ophrys employs ‘sexual deceit’ to ensure its pollination by bees. Here, one petal of its flower bears an uncanny resemblance to the female of the bee in size, colour and markings. The males bee is attracted to what is perceives as a female, ‘pseudocopulates’ with the flower, and during that process is dusted with pollen from the flower. When this same bee ‘pseudocopulates’ with another flower, it transfers pollen to it and thus, pollinates the flower.
Posted by Deepak Bhandari 7 years ago
- 1 answers
Meghna Thapar 5 years, 8 months ago
The DNA is a hydrophilic molecule which has sugar phosphate backbone. But the DNA cannot pass through the cell membrane as the cell membrane is hydrophobic in nature due to the presence of lipid bilayer. The hydrophilic and hydrophic molecules will remain separated. DNA cannot pass through a cell membrane as it is hydrophilic in nature whereas cell membrane is made up of lipid bilayer.
Posted by Satyakshi Kapil 7 years, 1 month ago
- 2 answers
N Aaditya 7 years ago
Posted by Arti Vishwakarma 7 years, 1 month ago
- 0 answers
Posted by Deepak Raj 7 years, 1 month ago
- 1 answers
Posted by Jyoti Gupta 7 years, 1 month ago
- 1 answers
Yogita Ingle 7 years, 1 month ago
- DNA polymorphism is a condition in which one of two different but normal nucleotide sequences can exist at a particular site in DNA.
- DNA fingerprinting is a technique of printing the DNA finger is used for comparing the nucleotide sequences of fragments of DNA from different sources. The fragments are obtained by treating the DNA with various endonucleases, enzymes that break DNA strands at specific sites.
- Polymorphism is the basis of genetic mapping of human genome as well as of DNA fingerprinting in DNA sequence. Therefore, it is essential to understand what DNA polymorphism means in simple terms. Polymorphism is variation at genetic level. It arises due to mutations. New mutations may arise in an individual either in the germ cells or in somatic cells. Thus, it helps in DNA fingerprinting.
Posted by Anjana Patel 7 years, 1 month ago
- 1 answers
Posted by Vandana Negi 7 years, 1 month ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Akash Deep 7 years ago
1Thank You