Natural Selection can maintain a polymorphism when

a. heterozygote is fitter than the homozygote

b. Fitnesses of genotypes are negatively frequency dependent.

c. Fitnesses of genotypes are positive frequency dependent.

d. One homozygote is fitter than the heterozygote

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#Question id: 18610

#Unit 13. Methods in Biology

In an experiment, it was found that the value of Tm for DNA is 45 ̊C, when cell have 22% GC content at the above Tm, then what will be the effect on the value of Tm if GC% increases to 60%

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#Question id: 4228

#Unit 3. Fundamental Processes

Which of the following characteristics is directly related to the coding of a single amino acid during the process of translation?

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#Question id: 7278

#Unit 5. Developmental Biology

The following demonstrates the blastocoel formation in the mammals. Which of the following statement is correct?

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#Question id: 33702

#Unit 2. Cellular Organization

Choose true and false

A. Repetitive DNA is characterized by its relatively slow rate of renaturation.

B. Satellite DNA consists of very large sequences repeated many times in tandem in large clusters.

C. In humans, the α satellite family, found in centromeric regions, has a repeat unit length of 171 bp.

D. In mammalian genomes satellite DNA is less than 10%, but in the fruit fly Drosophila virilis, it amounts to 50%.

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#Question id: 7108

#Unit 5. Developmental Biology

Relative to the primitive streak and Henson's node, somite formation in the chick embryo occurs: