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This is because in unicellular organisms when the parent gets divided into two daughter cells then there is no Residue left behind that so it means that the parent organism is not died in fact it gets converted into two more cells and continue its life in the form of that you daughters

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Vishakha Dixit 6 years, 7 months ago

This is bcozz they do not die as they grew old. They usually undergo mitosis to reproduce,in which the organismitself getsdivided into two(cell division).

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Shivam Chaurasia 6 years, 7 months ago

Because they have reproducing power all over their life spsn

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ANSWER

What is allele?

Posted by Aman Siddiquee 6 years, 7 months ago

CBSE > Class 12 > Biology

3 answers

Aastha Saxena 6 years, 7 months ago

The pair of contrasting traits are called alleles...for example T for tall and t for dwarf are alleles of each other and together show the trait of hybrid dominant

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Shivam Chaurasia 6 years, 7 months ago

Alleles are genes coded for pair of contrasting characters.

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Yogita Ingle 6 years, 7 months ago

Alleles are a pair of alternative forms of a gene. Each gene is present in two alternative forms, each called an allele. Each allele controls a single trait. Traits can be either dominant or recessive. Tallness in a plant is a dominant trait, controlled by a dominant allele and is represented by “T” (capital). Shortness in a plant is a recessive trait, controlled by a recessive allele and is represented by “t” (small).

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Explain DNA replication

Posted by Anubhav Sharma 6 years, 7 months ago

CBSE > Class 12 > Biology

3 answers

Sanjay Rathaur 6 years, 7 months ago

Nice answer

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Shivam Chaurasia 6 years, 7 months ago

DNA unwinding by helicase then removing tension due to unwinding by tropoisomerase ,formation of origin of replication, formation of replicating fork, continuos and discontinuos strand formation, repairing by ligase of breakable part of new strand, new strand form then nucleotides are joined by phosphodiester bond catalyse by dna polymerase.

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Yogita Ingle 6 years, 7 months ago

DNA replication is the basis of biological inheritance where the DNA is copied with the help of various enzymes, such as helicases, topoisomerases, DNA polymerase and DNA ligase. In a bacterial cell, DNA replication begins at a specific point called the ‘origin of replication’. This is the reason why a piece of DNA is cloned into a vector during recombinant DNA procedures, as it is the vector that provides the origin of replication.

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Immune system gets weakened in AIDS .give reasons. (1 marks)

Posted by Imran 618 6 years, 7 months ago

CBSE > Class 12 > Biology

2 answers

Shivam Chaurasia 6 years, 7 months ago

Because synthesized dna by rna transcriptase not only affects t- lymphocytes, as well as other helper t lymphocytes so none of them remain left and body become deficient of immunity.in that case myobacterium or any normak disease could cause death.

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Ayushi Gupta 6 years, 7 months ago

Because AIDS is not a disease its a sympton and it effect immune system an AIDS person can't die with AIDS they die with other disease because immune system get damaged in this disease so person losses its immune power to fight with other diseases

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What are proto oncogenes

Posted by Imran 618 6 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Vishakha Dixit 6 years, 7 months ago

In our normal cells,cancer causing genes are also found.They are known as cellular oncogens and also known as proto oncogens.

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Define Lactational Amenorrhea.

Posted by Jasmine Jasmine 6 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Gaurav Seth 6 years, 7 months ago

Lactational amenorrhea is based on the principle that during the period of intense lactation after parturition, the menstrual cycle or ovulation does not occur.

It has been noticed that during the period of intense lactation after the parturition, the mother does not undergo menstruation and ovulation so the chances of conception are nearly nill. It also has no side effects but is effective only upto a maximum period of six months after parturition.

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Suggest an assisted reproductive technique that help the couple to have a child where the problem is with the female partner who cannot concieve

Posted by Abhilasha Abhi 6 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shivam Chaurasia 6 years, 7 months ago

Zift, ivf etc.

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Mention one assisted reproductive technology

Posted by Abhilasha Abhi 6 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shivam Chaurasia 6 years, 7 months ago

Zift

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What is Mendel's law

Posted by Archery Dood 6 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Gursharn Kaur 6 years, 7 months ago

Merlin was a scientist who who gave laws and principles for the basis of inheritance these laws are known as mandolins laws of inheritance he three laws

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What is mmr.

Posted by Ankur Awasthi 6 years, 7 months ago

CBSE > Class 12 > Biology

2 answers

Gursharn Kaur 6 years, 7 months ago

Maternal mortality rate is a ratio of the number of deaths of females before the pregnancy or prior to the birth of child

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Saquib Khan 6 years, 7 months ago

Maternal mortility rate

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Eazy way to study transcription

Posted by Govind Unnikrishnan 6 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Shivani Singh 6 years, 7 months ago

The Process rna form from template stand of dna

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What region testes of outside of body

Posted by Akash Tiwari 6 years, 7 months ago

CBSE > Class 12 > Biology

5 answers

Sia ? 6 years, 7 months ago

The testes — also called testicles — are two oval-shaped organs in the male reproductive system. They're contained in a sac of skin called the *******.

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Shivam Chaurasia 6 years, 7 months ago

To maintain temperature 4-5 cekcius lower than body temperature needed for spermatogenasis.

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Kirti Tawri 6 years, 7 months ago

During insmination the skin protect the ****** just way a very thin like sheet present over it

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Saquib Khan 6 years, 7 months ago

Reason is temprature

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Gursharn Kaur 6 years, 7 months ago

not able to understand the question

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I have to prepare biology project...but in a great dilemma ? to choose the topic....Plzz help me in choosing the easiest topic for preparing my project?

Posted by Dàñïyã Ãrshãd? 6 years, 7 months ago

CBSE > Class 12 > Biology

5 answers

Dàñïyã Ãrshãd? 6 years, 6 months ago

Thnkew @Harsh Pahuja

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Harsh Pahuja 6 years, 7 months ago

You can make project on allergies

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Tanvi Toor 6 years, 7 months ago

Needless ??

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Dàñïyã Ãrshãd? 6 years, 7 months ago

Thnku @Tanvi Toor?

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Tanvi Toor 6 years, 7 months ago

Pick any disease it is easy nd interesting also ?

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Difference between zoospore and a zygote

Posted by Gujjar Fagna 6 years, 7 months ago

CBSE > Class 12 > Biology

2 answers

Yogita Ingle 6 years, 7 months ago

Zoospore	Zygote
1.	A zoospore is a motile asexual spore that utilizes the flagella for movement.	A zygote is a non-motile diploid cell formed as a result of fertilization.
2.	It is an asexual reproductive structure.	It is formed as a result of sexual reproduction.