Question

Which statement about Thomas Hunt Morgan’s conclusion is true?

Traits like white eye color in fruit flies are recessive traits that are linked to the Y chromosome.
Traits like white eye color in fruit flies must be linked to both X and Y chromosomes to be expressed.

Traits like white eye color in fruit flies are dominant traits that are linked to X chromosomes.

Traits like white eye color in fruit flies are linked to the X chromosome.

Answer 1

Traits like white eye color in fruit flies are linked to the X chromosome.

Step-by-step explanation:

Thomas Hunt Morgan concluded that traits like white eye color in fruit flies are linked to the X chromosome. In Drosophila, the wild-type eye color is red (XW) and is dominant to white eye color (X). This discovery allowed Morgan to map the eye color trait to the X chromosome in 1910.

In addition to this, males, who have an XY chromosome pair, naturally lack a second allele copy on the Y chromosome, so their genotype can only be XWY or XY. Females, who are XX, can have two allele copies of the eye color gene. Therefore, the statement that is true is that traits like white eye color in fruit flies are linked to the X chromosome.

Answer 2

Traits like white eye color in fruit flies are linked to the X chromosome.

Look at the Punnett square for an X-linked recessive disease. Is it possible for a female offspring to have the disease?

no

Step-by-step explanation: