Sex-linked genes are located on sex chrosomomes and that are inherited together with them. If a X⁺X⁺ red-eyed female drosophila mates with a red-eyed male, 0% of the progeny will have white eyes. Option 2.
Genes are physically located and arranged in the chromosomes.
Each chromosome contains several genes that vary in length and code for different traits. So, all chromosomes are different, except for the homologous ones.
When talking about sex-linked genes, we refer to genes located in one of the sex chromosomes. In general, genes are linked to the X chromosome.
Being linked to one of the sex chromosomes means that these genes, and their corresponding alleles, will only be inherited together with the chromosome.
In the case of X-linked genes, a male that inherits the X chromosome from a heterozygous female can express either the dominant or the recessive trait, depending on which allele it got from the mother.
Eye color in drosophila is an x-linked trait and the gene responsible for the trait expresses complete dominance. This means
Genotypes Phenotypes
X⁺X⁺ Red-eyed female
X⁺X⁻ Red-eyed female
X⁻X⁻ White-eyed female
X⁺Y Red-eyed male
X⁻Y White-eyed male
If a red-eyed female (X⁺X⁺ or X⁺X⁻) mates with a red-eyed male (X⁺Y), the progeny will ONLY express red eyes.
This is because each parent provides an X chromosome to the progeny.
The male can only transmit the X⁺ chromosome that codes for red eyes.
Considering complete dominance, even if the female transmit the X⁻, the progeny will express the red phenotype.
The correct option is 2, 0% of the progeny will have white eyes.
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Complete question,
If a homozygous red-eyed female drosophila mates with a red-eyed male drosophila. what proportion of the female offspring will have white eyes?
