Question

1. in fruit flies, red eyes are dominant (e). white eyes are recessive (e). if the female fly has white eyes and the male fly has homozygous dominant red eyes, what are the possible phenotypes and genotypes of their offspring?\

% of possible genotypes:\
ee: \underline{\hspace{2cm}}\
ee: \underline{\hspace{2cm}}\
ee: \underline{\hspace{2cm}}\
% of possible phenotypes:\
red eyes: \underline{\hspace{2cm}}\
white eyes: \underline{\hspace{2cm}}

Explanation:

Step1: Determine Parent Genotypes

Female has white eyes (recessive), so genotype is \( ee \). Male is homozygous dominant red eyes, so genotype is \( EE \).

Step2: Perform Punnett Square

Cross \( EE \) (male) and \( ee \) (female). All offspring will get \( E \) from male and \( e \) from female, so all offspring have genotype \( Ee \).

Step3: Calculate Genotype Percentages

• \( EE \): 0% (no offspring with \( EE \))
• \( Ee \): 100% (all offspring are \( Ee \))
• \( ee \): 0% (no offspring with \( ee \))

Step4: Determine Phenotypes

• Red Eyes: \( Ee \) shows dominant trait (red), so 100% red eyes.
• White Eyes: \( ee \) is needed, but none, so 0% white eyes.

Answer:

• \( EE \): 0%
• \( Ee \): 100%
• \( ee \): 0%
• % of possible Phenotypes:

Red Eyes: 100%
White Eyes: 0%