Albinism is a rare autosomal trait in humans. At the OCA1 locus, the dominant allele (A) controls normal pigmentation and the recessive allele (a) controls albinism. A normally pigmented man, whose parents are normal normally pigmented, has one albino grandparent. This man marries a woman with the same pedigree. A. Draw this pedigree and include all 10 genotypes. B. What is the probability that this man is heterozygous for the albino allele

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

1. which of the following transport mechanisms utilizes energy? a. osmosis b. diffusion c. facilitated diffusion d. endocytosis