AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
An organism has a body cell with 28 chromosomes. How many chromosomes will be in a gamete of this organism?
A
28
B
14
C
56
D
7
Explanation: 

Detailed explanation-1: -The normal body cell of an organism contains 28 pairs of chromosomes. The number of chromosomes present in its germ cell will be : (a) 28.

Detailed explanation-2: -SOLVED: An organism has 28 pairs of chromosomes in its diploid somatic cells.

Detailed explanation-3: -The normal body cell of an organism contains 28 pairs of chromosomes.

Detailed explanation-4: -Somatic cell or normal body cells contain 28 pair of chromosomes. Therefore, 28*2 = 56 chromosomes (as one pair is equal to two chromosomes). Germ cells are haploid in nature therefore they contain only 28 chromosomes (not in pair, but singly).

Detailed explanation-5: -The Number of Chromosomes (n-Value) Human gametes contain 23 chromosomes. We can summarize this statement as 1n = 23 where n is the n‑value, the number of chromosomes in a gamete. When a 1n = 23 sperm fertilizes a 1n = 23 egg, the zygote will be 2n = 46.

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