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Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYReproduction in Lower and Higher Animals4 Marks
Question
Column I [Phases]Column II [Hormonal changes]
(1) Menstrual phase(a) Rapid secretion of LH
(2) Proliferative phase(b) Increased level of FSH and estrogen
(3) Ovulatory phase(c) Increased level of progesterone
(4) Secretory phase(d) Decrease in progesterone and estrogen
✓

Answer

Column I [Phases]Column II [Hormonal changes]
(1) Menstrual phase(d) Decrease in progesterone and estrogen
(2) Proliferative phase(b) Increased level of FSH and estrogen
(3) Ovulatory phase(a) Rapid secretion of LH
(4) Secretory phase(c) Increased level of progesterone

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Mutation explains the relationship between gene and DNA. The effects of large deletions and rearrangement in a segment of DNA results in loss or gain of gene and its function. Insertion or deletion of one or two bases changes the reading frame from the point of insertion or deletion. A classical example of point mutation is a change of single base pair in the gene for beta globin chain that results in change of amino acid residue glutamate to valine and results into a diseased condition called sickle cell anaemia.
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