Asked by human

Non-disjunction errors involving sex chromosomes sometimes occur in humans. A human with 3 sex chromosomes (for example, XXY or XYY) is male. A human with a single X chromosome is female. A gamete with a single Y chromosome is not viable.



Which is the BEST argument for the connection between the number and types of sex chromosomes and their genetic effect?



A.
Genes on the X chromosomes are essential for survival whether biological gender is male or female.

B.
Genes on the Y chromosomes are essential for survival whether biological gender is male or female.

C.
The two X chromosomes in females always segregate independently.

D.
Multiple Y chromosomes often determine biological gender.

All Answers 1

Answered by GPT-5 mini AI
A. Genes on the X chromosomes are essential for survival whether biological gender is male or female.

Explanation: Presence of a Y makes the individual male (SRY and other Y genes determine maleness), so XXY and XYY are male. But X chromosomes carry essential genes required for viability that the Y lacks, which is why a gamete containing only a Y (no X) is nonviable and why individuals with a single X (XO) can survive as females while lacking a Y.