In fruit flies, eye color is a sex linked trait. Red is dominant to white.?

1. What are the sexes and eye color of flies with the following geneotypes:


XRXr


XR x R


XRY


XrY


2. What are the geneotypes of these flies:


white eyed, male


white eyed, female


red eyed female (heterozygous)


red eyed, male


3. Show the cross of a white eyed female Xr Xr with a red-eyed male X R Y


4.Show a cross betwen a pure red eyed female and a white eyed male. What are the geneotypes of the parents ------%26amp;------


How many are:


white eyed male


white eyed, female


red eyed male


red eyed female


5. Show the cross of a red eyed female (heterozygous) and a red eyed male. What are the geneotypes of the parents? ------%26amp; ------


How many are:


white eyed male


white eyed female


red eyed male


red eyed female


What if the above cross, 100 males were produced and 200 females. How many total red-eyed flies would there be?In fruit flies, eye color is a sex linked trait. Red is dominant to white.?
1. What are the sexes and eye color of flies with the following geneotypes:


XRXr, female, red


XRXR, female, red


XRY, male, red


XrY, male, white





2. What are the genotypes of these flies:


white eyed, male-XrY


white eyed, female-XrXr


red eyed female (heterozygous)-XRXr


red eyed, male-XRY





3. Show the cross of a white eyed female Xr Xr with a red-eyed male X R Y





XrXr x XRY





offspring


XRXr


XrY





4.Show a cross betwen a pure red eyed female and a white eyed male. What are the genotypes of the parents





Parental: XRXR x XrY





Offspring


XRXr


XRY





------%26amp;------


How many are:


white eyed male-None


white eyed, female-None


red eyed male-50%


red eyed female-50%





5. Show the cross of a red eyed female (heterozygous) and a red eyed male. What are the genotypes of the parents?





Parental: XRXr x XRY





Offspring:


XRXR


XRXr


XRY


XrY





------%26amp; ------


How many are:


white eyed male-25%


white eyed female-0%


red eyed male-25%


red eyed female-50%


What if the above cross, 100 males were produced and 200 females. How many total red-eyed flies would there be?





All the females are red-eyed, half of the males are red-eyed, so 200 + 50 = 250.