Question

In snapdragons, heterozygotes for one of the genes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers?

Answer 1

Answer:

100%

Explanation:

If;

RR represents alleles for red flowers

rr represents alleles for white flowers

Then, Rr will represent alleles for pink flowers

When RR is crossed with rr, all the offspring will be Rr

RR   x   rr   = Rr, Rr, Rr, Rr

Hence, all the offspring (100%) will have pink flowers

Answer 2

The proportion of the offspring from this cross that will have pink flowers is 100%.

In genetic, incomplete dominance occurs when the phenotype of the offspring is a mixture or blend of the two parental phenotypes.

In this case, both parentals are homo-zygous for different alleles controlling the phenotypic trait 'flower color', thereby 100% of the offspring will be heterozygous and therefore will show pink flowers.

In conclusion, the proportion of the offspring from this cross that will have pink flowers is 100%.

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