An allele that expresses itself in a heterozygote is a(n)
A. recessive allele
B. allele pair
C. dominant allele
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Ответ:
The pollen tube delivers a tube nucleus and two cells, the sperm cells. One sperm cell fuses with the egg to give the embryo, which is diploid. The other sperm cell fuses with the two polar nuclei to give the endosperm, which is triploid.