2.) Cross a homozygous red plant with a homozygous blue plant. Red plant is the dominant trait. Find the genotypic and phenotypic ratio.
Answer:
When a homozygous red plant (RR) is crossed with a homozygous blue plant (rr), the resulting offspring will all be heterozygous (Rr) and have a red phenotype.
The Punnett square for this cross would be:
R R
r Rr Rr
r Rr Rr
The genotypic ratio of the offspring would be 2:2, or 1:1, for Rr and rr.
The phenotypic ratio of the offspring would be 4:0, or 100% red. This is because the red phenotype is dominant over the blue phenotype, and all of the offspring have at least one dominant R allele.
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