Question

Flower position in pea plants can be axial (A) or terminal (a). The homozygous dominant genotype for this trait would be:

1) AA
2) Aa
3) aa

Answer 1

The homozygous dominant genotype for axial flower position in pea plants is AA. The F1 generation from a cross of AA and aa would be all Aa, while the F2 generation would show a 1:2:1 genotype ratio and 3:1 phenotype ratio for axial to terminal flowers.

Step-by-step explanation:

The homozygous dominant genotype for flower position in pea plants, given that axial (A) is dominant to terminal (a), would be AA. The possible F1 from a cross of homozygous dominant (AA) and homozygous recessive (aa) parents would all be heterozygous (Aa), displaying the axial phenotype. The F2 generation from crossing two F1 individuals (Aa x Aa) would have the genotype and phenotype ratios of 1:2:1 for genotypes (AA:Aa:aa) and 3:1 for phenotypes (axial:terminal), using a Punnett square for illustration.