The peterson family has three boys. if mrs. peterson is pregnant with her fourth child, what is the probability that this child will be a girl?

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength

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

Why are common names a problem for scientist?