Apure-breeding short strain of pea produces plants that are 20-26 cm in height. a pure-breeding tall strain of pea produces plants that are 46-55 cm in height. when these pure-breeding strains are crossed, the f1 plants range in height from 32 to 48 cm. which of the following statements about phenotypic variance in height is true? a) the f1 variance is due only to genetic factors. b) the f1 variance is due only to environmental factors. c) the f1 variance is due to a combination of genetic and environmental factors. d) the variance in the tall parental strain is due to a combination of genetic and environmental factors.

Some species of wasps are social. the queen starts a colony from scratch each spring. she builds a small nest, and lays and raises a group of female workers. the workers enlarge the nest while the queen continues to lay eggs. unfertilized eggs become males that mate with newly hatched females. all of the wasps except the newly fertilized females die by the summer. which best describes this behavior? a)it is beneficial only to the males that do not fertilize eggs. b)it is beneficial only to the female workers that are not fertilized. c)it is beneficial to each one of the individual colony members. d)it is beneficial to the whole species, but not to all of the individual members.