Multiple Choice
Sasha's 23rd chromosome pair contains two X chromosomes. This indicates that Sasha:
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3. Extensions to Mendelian Inheritance
Sex Chromosome
Multiple Choice
In Drosophila melanogaster, which pair of chromosomes determines the sex of the individual?
A
The first pair
B
The fourth pair
C
The sex chromosomes (X and Y)
D
The second pair
Verified step by step guidance1
Understand that in Drosophila melanogaster (fruit flies), sex determination is controlled by a specific pair of chromosomes known as the sex chromosomes.
Recall that Drosophila has four pairs of chromosomes: three pairs of autosomes and one pair of sex chromosomes.
Identify that the sex chromosomes in Drosophila are labeled as X and Y, similar to humans, and these chromosomes determine the sex of the individual.
Recognize that the first, second, and fourth pairs are autosomes and do not determine sex; only the sex chromosomes (X and Y) do.
Conclude that the pair responsible for sex determination is the pair of sex chromosomes, which is distinct from the numbered autosomal pairs.
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