how would i plan a test cross to identify the genotypes of individuals from the F2 generation?

Answer 1

Test cross is when F2 generation individuals are crossed with recessive homozygote for the trait.

F2 generation:
Individuals with recessive phenotype are recessive homozygotes.

But individuals with dominant phenotype are dominant homozygotes or heterozygotes.
So if you cross dominant phenotype individual with recessive homozygot:
1. progeny of recess. homozyg and dom. homozyg will be uniform: heterozygotes with dominant phenotype.

2. Progeny of recess. homozyg. and heterozyg. will be: dominat phenotype heterozygotes and recessive homozygotes with recess phenotype. Segregation ratio is 1:1.

This all is only valid for Mendelian inheritance

good luck

Answer 2

Willy is right. A "backcross" with another F2 won't tell you everything you need to know, but crossing F2 with homozygous recessive individuals will be very telling. That's the definition of a test cross anyway, crossing individuals of unknown genotype with homozygous recessives in order to determine the genotypes of the unknowns.

Answer 3

to get the genotypes of the F2 generation to identify themselves you would need to back cross the F2 generation with another F2 generation prodgeny. the genotypes will then expose themselves per mendels law

Answer 4

you.ve got me on that one