What is the genotype of a female fruit fly with white eyes?
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.
How are red white eyes inherited in fruit flies?
This is a clear demonstration of sex-linked inheritance. The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive. When a red eyed male mates with white eyed females, their daughters will have red eyes, but their sons will have white eyes.
Can a female fruit fly that is homozygous dominant for red eyes have any offspring with white eyes?
The cross is between a red-eyed fruit fly and a white-eyed (rr) fruit fly. The only way an offspring can have white eyes, is if it inherited a recessive allele from both parents. 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 probability of getting offspring that are red eyed males?
25%
What ratio of offspring would result from a cross between a white-eyed male and a female that is heterozygous for red eye color?
three quarters
What percentage of offspring is yellow?
The result is a 1 in 4 (25 percent) probability of both parents contributing a Y, resulting in an offspring with a yellow phenotype; a 25 percent probability of parent A contributing a Y and parent B a y, resulting in offspring with a yellow phenotype; a 25 percent probability of parent A contributing a y and parent B …
What is the percentage of a homozygous dominant offspring?
| PARENT GENOTYPES | OFFSPRING PHENOTYPES |
|---|---|
| pure (homozygous) dominant x anything | 100% of offspring with dominant trait |
| hybrid x homozygous recessive | 50% dominant trait, 50% recessive trait |
| hybrid x hybrid | 75% with dominant trait & 25% with recessive trait |
| homozygous recessive x homozygous recessive | 100% recessive trait |
What is the percentage of heterozygous recessive offspring?
The Punnett square below makes it clear that at each birth, there will be a 25% chance of you having a normal homozygous (AA) child, a 50% chance of a healthy heterozygous (Aa) carrier child like you and your mate, and a 25% chance of a homozygous recessive (aa) child who probably will eventually die from this …
What percentage of offspring have white flowers?
Predicting Offspring Phenotypes Only offspring with the bb genotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers.
Which flower color is dominant purple or white?
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| Trait | Dominant Expression | Recessive Expression |
|---|---|---|
| Color of flower (P) | Purple | White |
| Form of ripe pods (I) | Inflated | Constricted |
| Color of unripe pods (G) | Green | Yellow |
| Position of flowers (A) | Axial | Terminal |
What is the percentage of the offspring that will have red color?
You also know that the Rr genotype gives red flower-color. This happens in two combinations: 2(1/2*1/2) = 1/2. So, so far, 3/4 of the offspring have red flowers.