NEET BIOLOGY

Detailed explanation-1: -The investigations on the goat worked by Sokolov (’30), Shiwago (’31), Krallinger (’31) and Berry (’38) agree in respect of the number of chromosomes, finding 60 chromosomes for the diploid and 30 for the haploid.

Detailed explanation-2: -If a cell has 15 pairs of chromosomes (n = 15), it has 30 chromosomes (2n = 30). At the end of mitosis, the two daughter cells will be exact copies of the original cell. Each daughter cell will have 30 chromosomes.

Detailed explanation-3: -so an animal with a diploid number of chromosomes equal to 30 will produce four gametes. Each gamete will contain 15 chromosomes due to meiosis.

Detailed explanation-4: -The haploid number in humans is given as 2n=46, n = 23, this is because the haploid human cells possess one set of 23 chromosomes – 22 sets of autosomal chromosomes (non-sex chromosomes) and 1 set of sex chromosomes.

Detailed explanation-5: -The haploid cells contain half the number of chromosomes as the diploid cells. Thus, if a diploid cell contains 40 chromosomes, then the haploid cell will contain 20 chromosomes.