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?

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

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.