AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -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-3: -Diploid mouse cells have 40 chromosomes.

Detailed explanation-4: -Mice (Mus musculus) have 40 chromosomes per diploid cell (2n=40) ( 2 n = 40 ) . How many double-stranded DNA helices, and how many chromosomes are there in a mouse cell that is in the G1 stage of the cell cycle? a. 80 DNA helices and 40 chromosomes.

Detailed explanation-5: -Humans are diploid, and most of the body’s cells contain 23 chromosomes pairs. Human gametes (egg and sperm cells), however, contain a single set of chromosomes and are said to be haploid.