Each gamete gets just one crest allele. Half of the gametes will get one of the parent's alleles, and the other half will get the other allele. The Punnett square shows the possible crest allele combinations in the offspring. There are 4 possible combinations in all.
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The best explanation for what do arteries, veins, and capillaries do is that they A - arteries normally carry oxygen-rich blood away from the heart, veins on the other hand generally carry oxygen-depleted blood back to the heart. Capillaries, however, deliver blood to individual cells.
