Question

shakira is a volunteer at the local community garden. she has been asked by the garden director to raise some gerber daisies for the garden to sell in order to help fund the seeds needed for the next vegetable crop. shakira thinks red and yellow would be the best colors, but she also knows from her biology class that yellow is a recessive trait in gerber daisies. if she cross pollinates a yellow daisy with a known homozygous red daisy, what are the odds she will end up with a yellow daisy plant? complete a punnet square for the cross, upload it to this answer text box and calculate the odds. red is dominant (r) yellow is recessive (r)

Answer 1

Shakira would end up with 0 yellow daisies if she cross pollinate a yellow daisy with a known homozygous dominant red daisy.

All possible offspring will be red.

Step-by-step explanation:

ok so Shakira cross pollinates a homozygous dominant red daisy with a homozygous recessive yellow daisy.

(We know that the yellow daisy is homozygous since the trait is recessive hence it would only be shown in the absence of the dominant red gene.)

Homozygous means that both alleles for the gene are same while heterozygous means both alleles are not the same for a specific gene.

Denoting:

R as dominant red gene

r as recessive yellow gene

Parental phenotype: Red daisy 》 yellow daisy

parental genotype: RR 》 rr

parental gametes: (R) (R) 》 (r) (r)

Random fertilization: punnet square

R R

r Rr Rr

r Rr Rr

F1 generation phenotype: Red daisy 》 yellow daisy

F1 generation genotype: Rr, Rr, Rr, Rr 》 -

Ratio: 1 : 0

Percentage: 100% red 》 0% yellow