Hereditary diseases are mainly caused by
a. defective viruses.
b. weakened immunity.
c. abnormal chromosomes.
d. unhealthy lifestyle choices.

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided

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

Pulmonary arteries carry highly oxygenated blood. true or false?