Question

why does individual iv - 7 have colorblindness? because his dad has it. because his uncle has it. because his siblings have it. because his mom is a carrier.

Explanation:

Colorblindness (red-green, the most common type) is an X-linked recessive trait. Males (like individual IV-7) inherit their X chromosome from their mother and Y from their father. For a male to have X-linked recessive colorblindness, he only needs to receive one affected X chromosome, which comes from his mother (who would be a carrier, as she can pass the affected allele without showing the trait herself). The other options are incorrect because males do not inherit X-linked traits from their father (who gives a Y chromosome), and uncles/siblings do not pass the trait directly to him in this inheritance pattern.

Answer:

Because his mom is a carrier.