Multiple Choice
During which stage of meiosis do the cells have only one allele for each gene?
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12. Meiosis
Introduction to Meiosis
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many chromosomes do human cells have before meiosis begins?
A
92
B
23
C
69
D
46
Verified step by step guidance1
Understand that human cells are diploid, meaning they have two sets of chromosomes, one from each parent.
Recognize that before meiosis begins, human cells are in the diploid state, which is the normal state for somatic cells.
Recall that the diploid number of chromosomes in humans is 46, which includes 22 pairs of autosomes and 1 pair of sex chromosomes.
Before meiosis starts, the cell undergoes DNA replication during the S phase of the cell cycle, but the chromosome number remains the same at 46; however, each chromosome consists of two sister chromatids.
Conclude that the number of chromosomes in human cells before meiosis begins is 46, as meiosis will later reduce this number to 23 in gametes.
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