Question

a student crosses two homozygous plants, one with green pods and the other with yellow pods. if yellow is dominant over green, what phenotypic results will the student find in the offspring?
a. 100% yellow
b. 75% yellow, 25% green
c. 75% green, 25% yellow
d. 100% green

Explanation:

Step1: Define allele notation

Let $Y$ = dominant yellow allele, $y$ = recessive green allele.

Step2: Identify parent genotypes

Homozygous yellow: $YY$; Homozygous green: $yy$.

Step3: Determine gametes produced

$YY$ produces only $Y$ gametes; $yy$ produces only $y$ gametes.

Step4: Cross gametes for offspring

All offspring get $Y$ and $y$, so genotype $Yy$.

Step5: Determine phenotype

$Y$ is dominant, so $Yy$ = yellow phenotype.

Answer:

A. 100% yellow