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Question
Given diagram shows variations in the amount of DNA of a developing eukaryote. What the arrow denotes?
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Solution
The correct option is B Second meiotic anaphase
- The given graph shows variations in the DNA content in the cell of a eukaryote. Haploid set of chromosomes 1C which is present in gamete which on fertilization with a gamete of opposite sex acquires a diploid set of chromosomes (2C) and transforms into the embryo.
- Embryos develop and grow into diploid organisms by multiple mitotic divisions. During sexual reproduction, gamete formation takes place by the meiotic division under which the initial amount of DNA (2C). During S- phase, which in first meiotic division reduces to half i.e., 2C, divided among two daughter cells whereas chromosomal number reduces to half i.e., from 2n.
- During the second meiotic division, the amount of DNA is further distributed equally from each daughter cells (from the first meiotic division) to two daughter cells. The second meiotic division is equational, therefore the number of chromosomes remains the same as produced at the end of meiosis I.
- Thus at the end of meiosis II, each of the four haploid daughter cells contains one copy of every chromosome in the set (1C) rather than two.
So, the correct answer is 'Second meiotic anaphase'.
- The given graph shows variations in the DNA content in the cell of a eukaryote. Haploid set of chromosomes 1C which is present in gamete which on fertilization with a gamete of opposite sex acquires a diploid set of chromosomes (2C) and transforms into the embryo.
- Embryos develop and grow into diploid organisms by multiple mitotic divisions. During sexual reproduction, gamete formation takes place by the meiotic division under which the initial amount of DNA (2C). During S- phase, which in first meiotic division reduces to half i.e., 2C, divided among two daughter cells whereas chromosomal number reduces to half i.e., from 2n.
- During the second meiotic division, the amount of DNA is further distributed equally from each daughter cells (from the first meiotic division) to two daughter cells. The second meiotic division is equational, therefore the number of chromosomes remains the same as produced at the end of meiosis I.
- Thus at the end of meiosis II, each of the four haploid daughter cells contains one copy of every chromosome in the set (1C) rather than two.
So, the correct answer is 'Second meiotic anaphase'.
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