An organism that shows a dominant trait (purple flowers) , is either homozygous or heterozygous for the dominant allele: By performing a test cross, with a homozygous recessive individual the unknown genotype can be determined: Part A: Fill in pre-drawn Punnett squares (remember vou"Il need to test BOTH heterozygous and homozygous)- Part 8: determine the offspring genotypes- PPXPP Pp x PP Part C: determine the offspring phenotypes- PP XPp Pp X PP'

Answer 1

Part A:

Homozygous dominant x Homozygous recessive:

| | P | p |
|---|---|---|
| P | PP | Pp |
| P | PP | Pp |

Heterozygous dominant x Homozygous recessive:

| | P | p |
|---|---|---|
| P | Pp | Pp |
| P | Pp | Pp |

Part B:

Homozygous dominant x Homozygous recessive:

- All offspring will be heterozygous dominant (Pp)

Heterozygous dominant x Homozygous recessive:

- 50% of offspring will be heterozygous dominant (Pp)
- 50% of offspring will be homozygous dominant (PP)

Part C:

Homozygous dominant x Homozygous recessive:

- All offspring will have the dominant phenotype (purple flowers)

Heterozygous dominant x Homozygous recessive:

- 100% of offspring will have the dominant phenotype (purple flowers)