Question

how are the alleles for sex - linked traits inherited?

• they are passed from the y chromosome in parents to the x chromosome in offspring.
• they are passed from the x chromosome in parents to the xy chromosome in offspring.
• they are passed from parents to offspring on the x and y chromosomes.
• they are passed from any chromosome in the parents to the x or y chromosome in the offspring.

Explanation:

Sex-linked traits are carried on sex chromosomes (X and Y). Fathers pass their Y chromosome to sons and X chromosome to daughters, while mothers pass an X chromosome to all offspring. Thus, these alleles are inherited via parental X and Y chromosomes to offspring.

Answer:

They are passed from parents to offspring on the X and Y chromosomes.