Question

The allele for red flower colour is RThe allele for yellow flower colour is rRed, R is dominantcross a homozygous red-flowered plant with a yellow-flowered plant. a) What is the genotype of the gametes for each parent plant, i.e., thehomozygous red flowered plant and the yellow flowered plant? b)If you crossed the red flowered plant with the yellow flowered plant,what would the genotype and phenotype of the offspring be?

Answer 1

In this cross, we have a homozygous red-flowered plant and a yellow-flowered one. This means the red-flowered plant has a RR genotype and can only produce gametes with an R genotype, and that the yellow-flowered plant has an rr genotype and produces gametes with an r genotype.

As one plant produces only R gametes and the other produces only r gametes, their offspring would have an Rr genotype, and given that the red is the dominant allele, they would all have red flowers.