PATHOLOGY

PATHOLOGY MCQ

GENETICS AND DISEASE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If 2n = 48 for a particular cell, then the chromosome number in each cell after meiosis would be
A
96
B
48
C
24
D
12
Explanation: 

Detailed explanation-1: -Pollen mother cell (PMC) is diploid. It undergoes meiosis to form haploid microspores. Therefore if the number of chromosomes in PMC (2n) is 48 then the number of chromosomes in microspores (n) will be half that is 24.

Detailed explanation-2: -If number of chromosomes in a cell after meiosis I is 48 then after meiosis II, the daughter cells will also have 48 chromosomes as because meiosis II is an equational division.

Detailed explanation-3: -Answer and Explanation: After meiosis, the daughter cells will be haploid and will only have half the species number of chromosomes, in this case, 12 chromosomes. If the parent diploid cell has 24 chromosomes prior to meiosis, then all of the daughter cells will only have 12 chromosomes after the two rounds of meiosis.

Detailed explanation-4: -When a diploid cell having 48 chromosomes divides, the four haploid daughter cells are produced at the end of meiosis II. Each daughter cell contains half of the chromosomes in number as that of the parent cell. Thus, it can be concluded that daughter cells produced from the parent cell will have 24 chromosomes.

Detailed explanation-5: -Each daughter cell will have half of the original 46 chromosomes, or 23 chromosomes. Each chromosome consists of 2 sister chromatids. The daughter cells now move in to the third and final phase of meiosis: meiosis II.

There is 1 question to complete.