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: Analizar los genotipos de los padres

La hembra es homocigota dominante (\(AA\)) y el macho es homocigota recesivo (\(aa\)).

Step2: Realizar el cruce

Al cruzar \(AA\times aa\), todos los descendientes tendrán el genotipo \(Aa\).

Step3: Determinar los fenotipos

Como \(A\) (ojos ovalados) es dominante sobre \(a\) (ojos redondos), todos los descendientes con genotipo \(Aa\) tendrán ojos ovalados.

Answer:

1. \(1\) (único genotipo \(Aa\))
2. \(1\) (único fenotipo: ojos ovalados)
3. \(100\%\) (todos \(Aa\) expresan el fenotipo dominante)
4. \(0\%\) (ningún descendiente tiene \(aa\))
5. Ojos ovalados (\(AA\) expresa el fenotipo dominante)
6. Ojos redondos (\(aa\) expresa el fenotipo recesivo)
7. \(4:0\) (todos con ojos ovalados)
8. \(4:0\) (todos \(Aa\))