Question

How many heterozygous and homozygous examples with round yellow and wrinkled green?

Answer 1

Considering the genes for yellow as YY and Round as RR and green as yy and wrinkled as rr,

after F2 cross

Homozygous:    

• YYRR=1
• YYrr=1
• yyRR=1
• yyrr=1

Heterozygous:

• YYRr=2
• YyRR=2
• YyRr=4
• Yyrr=2
• yyRr=2

Now, for expalantion,

Homozygotes are those which contain same alleles.

Heterozygotes are those which contain different alleles.