Question

A plant called blue-eyed grass normally produces blue flowers. However, plants producing white flowers also occur, because an allele for the gene coding for the protein that produces the blue pigment is non-functional. This white-flowered allele (W) is dominant to the blue-flowered allele (w), but generally occurs at very low frequency in populations. Suppose you crossed a homozygous dominant plant with a homozygous recessive plant, and the result is 16 seeds. If you plant these, assuming simple Mendelian genetics, how many do you predict are blue-flowered?

Answer 1

It is guven that W allele encodes white color which is dominant over w allele. w allele in homozygous recessive conditions produces blue color.

Now the homozygous white plant have WW genotype. And homozygous blue plant have genotype of ww.

Parents: WW ( white) × ww ( blue)

Punnet square:

Gametes	w
W	Ww ( white)

That's why all 16 seeds produced by the crossing of these plants have white phenotype.

Out of 16 seeds, the blue colored phenotype of seeds is 0.

None of the seeds have blue color.