NEET BIOLOGY

Detailed explanation-1: -Thus if the chromosome number in a diploid zygote is 40, then it means the diploid organism has 40 chromosomes in total and this will reduce to its half at the time of gamete formation through meiosis. Therefore, the chromosome number in a gamete will be 20. So the correct answer is B. 20.

Detailed explanation-2: -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. During meiosis, a diploid cell undergoes two successive rounds of cell division to form four haploid cells.

Detailed explanation-3: -When a cell with 40 chromosomes undergoes meiosis, each of the four resulting cells has. Solution : (a) 20 chromosomes, because in merosis cell dicison chromosome number becomes halved.

Detailed explanation-4: -The correct answer: In a certain organism 2n=40. Sperm cells will have n=20 chromosomes. The organism has 40 chromosomes in the diploid cells in their body. Since the male gamete sperm is produced with the help of meiosis, therefore the chromosome number in the gamete is reduced to half in the gametes.

Detailed explanation-5: -The diploid number can be calculated by multiplying the haploid number by 2. The variable ‘N’ represents the number of chromosomes in the genome. Thus, the haploid number of chromosomes is equal to N. The diploid number of chromosomes is equal to 2N.