the f2 offspring of a monohybrid cross would show the genotypes?

Question

i dont understand this at all it says the answer is AA,Aa and aa but i dont understand how it would be

Answer 1

Hi Kali,

If the alleles follow Mendelian genetics these would be the result you would see in F2 offspring. 

 

F1     AA x aa the progeny would be Aa and all would show the dominat phenotype

 

F2     On selfing the F1 progeny the cross would be Aa x Aa. If you draw a punnet square for this cross you would get a ratio of 1:2:1  Homozygous dominant : 2(Heterozygous dominant) : Homozygous recessive which will be AA:2(Aa):aa

 

Please let me know if you need further explanation.

Best

Sanjay