AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If a regular body cell had 30 chromosomes, how many chromosomes would be found in the zygote?
A
30
B
60
C
15
D
cannot tell
Explanation: 

Detailed explanation-1: -Each daughter cell will have 30 chromosomes. At the end of meiosis II, each cell (i.e., gamete) would have half the original number of chromosomes, that is, 15 chromosomes.

Detailed explanation-2: -If a cell has 30 chromosomes before mitosis, each daughter cell also has 30 chromosomes. Mitosis is the process of cell division and makes two identical daughter cells from one parent cell.

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: -Zygote is formed due to the fusion of male and female gametes. Gametes are haploid cells. Thus fusion of two haploid cells results in the formation of a diploid cell. Therefore zygote is a diploid cell with 46 chromosomes.

Detailed explanation-5: -If there are 30 chromosomes in G1 phase, then there will be 15 bivalents in zygotene stage.

There is 1 question to complete.