Variations during mutations of meiotic recombinations are:
random and directionless

Variation appear during meiosis due to

True and False: Darwinian variation is large and directionless.

During the meiotic division, the

While creation and presence of variations is directionless, natural selection is directional as it is in the concept of adaptation . Explain.

These question consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following responses If both Assertion and Reason are true and Reason is a correct explanation of Assertion If both Assertion and Reason is a not a correct explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Assertion: Gene flow increases genetic variations Reason: The random introduction of new alleles into recipient population and their removal from the donor population affects allele frequency

Bring out the differences between De Vries mutations and Darwinian variations.

What are the various stages of meiotic prophase-I? Enumerate the chromosomal events during each stage?

The graph given below shows the variations in the levels of ovarian hormones during various phases of menstrual cycle: Compare the role of A and B .

The graph given below shows the variations in the levels of ovarian hormones during various phases of menstrual cycle: Under which condition will the level of B continue to remain high on the 28^th day?

The graph given below shows the variations in the levels of ovarian hormones during various phases of menstrual cycle: Identify A and B .