Question

c. in humans, oval - shaped eyes (a) are dominant to round - shaped eyes (a). cross a female who is homozygous dominant with a male who is homozygous recessive. then, answer the questions that follow. 1. how many possible genotypes are there among the offspring? 2. how many possible phenotypes are there among the offspring? 3. what percentage of the offspring have oval - shaped eyes? 4. what percentage of the offspring have round - shaped eyes? 5. what eye shape does the female parent have? 6. what eye shape does the male parent have? 7. what is the phenotypic ratio of their offspring? 8. what is the genotypic ratio of their offspring?

Explanation:

Step1: Determine Parent Genotypes

Female: \( AA \) (homozygous dominant), Male: \( aa \) (homozygous recessive).

Step2: Create Punnett Square

	\( A \)	\( A \)
\( a \)	\( Aa \)	\( Aa \)

Step3: Analyze Genotypes

All offspring are \( Aa \). So, 1 genotype.

Step4: Analyze Phenotypes

\( A \) (oval) is dominant. All \( Aa \) show oval. So, 1 phenotype.

Step5: Calculate Oval - Shaped Percentage

All \( Aa \) (100% oval as \( A \) is dominant).

Step6: Calculate Round - Shaped Percentage

No \( aa \) (0% round).

Step7: Determine Female Parent Eye Shape

Female is \( AA \) (oval - shaped as \( A \) is dominant).

Step8: Determine Male Parent Eye Shape

Male is \( aa \) (round - shaped as \( a \) is recessive).

Step9: Find Phenotypic Ratio

All oval. Ratio \( 4:0 \) (simplify to \( 1:0 \)).

Step10: Find Genotypic Ratio

All \( Aa \). Ratio \( 4:0 \) (simplify to \( 1:0 \)).

Answer:

1. \( 1 \)
2. \( 1 \)
3. \( 100\% \)
4. \( 0\% \)
5. Oval - shaped
6. Round - shaped
7. \( 1:0 \) (all oval)
8. \( 1:0 \) (all \( Aa \))