Question

DNA in the nucleus of a rabbit egg is 1.8 picograms, its liver cell will have mass of DNA --- picograms.
A. 7.2
B. 0.9
C. 1.8
D. 3.6

Answer 1

Hint:-Two daughter cells which are produced by mitosis, each of them will have the same number of chromosomes as their parent cell. Meiosis, in contrast, gives rise to four different kinds of daughter cells, each with half the number of chromosomes is present in the parent cell. Since meiosis gives rise to cells that are intended to become gametes (or reproductive cells), this decrease in the number of chromosomes is critical; in order to maintain chromosomes in individuals.

Complete step-by-step solution:-
A chromosome is a structure with a double helix that houses DNA and protein in cells. It is a strand of DNA that has genes that are found in living organisms. Proteins are also included, which help bundle the DNA and monitor its functions. A pair of chromosomes of a similar length, position of the centromere, and genes at the corresponding location for the same trait are homologous chromosomes.
Liver cells are regular, diploid cells in an individual produced by meiosis. Egg and sperm are germ cells produced by meiosis, a form of cell division that produces four daughter cells with half the chromosome number compared to the parent cell, with two successive nuclear divisions after one round of chromosome replication. Thus, in otherwise diploid species, egg and sperm are haploid cells.
The rabbit is a diploid organism and the haploid DNA content (1.8 picograms) represents its egg. Liver cells are diploid cells and would thus have twice the DNA content, i.e. 1.8 X 2= 3.6 picograms, relative to the egg cell. Thus, the correct answer is option (D), 3.6 picograms.

Note:-
Meiosis is essential in ensuring that the proper number of chromosomes is contained in all organisms created by sexual reproduction. Meiosis also induces genetic variation by means of recombination. Later, as two gametes combine during fertilization, this variation is increased even more, thereby producing offspring with special DNA combinations. In sexual reproduction, this mixing of parental DNA helps drive the remarkable uniqueness of life on Earth.