What is the genotype of a heterozygous red eyed female?
Genotypes and phenotypes of offspring if the female is heterozygous. Half of the male and half of the female offspring of a heterozygous female would be white-eyed; the other half would be red-eyed. Therefore the female must be a heterozygous, Xw+ Xw.
What color eyes would a heterozygous fruit fly have?
In this example, there are two different alleles for the eye color gene: the E allele for red eye color, and the e allele for brown eye color. The red (E) phenotype is dominant to the brown (e) phenotype, so heterozygous flies with the genotype Ee will have red eyes.
What is the genotype of the red eyed male fruit fly?
What is the genotype of a red eyed male? Homozygous dominant for the red encoding allele – genotype: XWXW; phenotype: red eyes. Heterozygous – genotype XWXw; phenotype: red eyes. Homozygous recessive with two white encoding alleles – genotype XwXw; phenotype white eyes.
What would be the result of a cross between a white-eyed female and a red-eyed male?
When a female fruit fly with recessive x-linked white-eyed is crossed with a red-eyed male, it will yield heterozygous daughters with red-eyed and hemizygous sons with white-eyed. Therefore, the percentage of white eyes female offspring will be zero as all daughters will be red-eyed and heterozygous.
Can a female fruit fly be heterozygous for eye color?
The only way an offspring can have white eyes, is if it inherited a recessive allele from both parents. The gene for eye color in fruit flies is actually sex-linked on the X-chromosome. Only females can be homozygous or heterozygous for red eye color. The males have only one allele for eye color on their X-chromosomes.
What is the genotype of a female who is heterozygous for eye color?
BB
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb.
Can female flies have white eyes?
The appearance of white eyes in females shows that this trait is not lethal in females. All possible combinations of white eyes and sex are possible. The white-eye trait can be carried over to females when F1 females are crossed with white-eyed males.
What is the genotype of a white eye female fly?