AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Gametes, or sex cells, are considered to be ____ cells with ____ chromosomes.
A
haploid; 23
B
haploid; 46
C
diploid; 23
D
diploid; 46
Explanation: 

Detailed explanation-1: -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.

Detailed explanation-2: -The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.

Detailed explanation-3: -Egg and sperm cells have just 23 chromosomes each. That’s half as many chromosomes as regular cells. Through the process of fertilization, egg and sperm join to make a cell with 46 chromosomes (23 pairs), called a zygote. For each chromosome pair, one homologous chromosome came from each parent.

Detailed explanation-4: -In other words, gametes have only 23 chromosomes (referred to as the haploid number (1n). Meiosis, then, is the process by which specialized diploid stem cells in the ovary (oogonia) and testes (spermatogonia) produce eggs and sperm which have a haploid number of chromosomes.

Detailed explanation-5: -In human cells, the parent cell has 46 chromosomes (23 pairs), so the cells produced by meiosis have 23 chromosomes. These cells will become gametes.

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