Leaves 1. Which bird is most likely the oldest
species?

2. Why did these bird populations
change?

3. What is the physical trait that
changed in these birds caused by
natural selection?

4. Is this an example of convergent or
divergent evolution?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4