If two parents are heterozygous for a dominant and recessive allele it will be possible for them to

a) two phenotypes for that trait among their offspring

b) only one phenotype for that trait among their offspring and no more

c) four phenotypes for that trait among their offspring

d) four different genotypes for that trait among their offspring

e) only one genotype for that trait among their offspring and no more

Which of the following systems in absorbing oxygen and releases carbon dioxide

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

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.