Question

which statement about thomas hunt morgans 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. done

Explanation:

Morgan's experiments with fruit flies showed that white - eye color is a recessive trait. In fruit flies, males have XY chromosomes and females have XX chromosomes. The white - eye trait was more commonly seen in males. Since males have only one X chromosome (from the mother), if the X chromosome carries the recessive white - eye allele, the trait is expressed. Females need two copies (one from each parent) to express the recessive trait. This indicates that the white - eye trait is linked to the X chromosome.

• The first option is wrong because the trait is linked to the X, not the Y chromosome.
• The second option is incorrect as it is not linked to both X and Y.
• The third option is wrong because white - eye is a recessive, not a dominant trait.

Answer:

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