Which of the following statements are considered to be normal? a. normal heart rates vary from 30 beats/minute up to 200 beats/minute. b. a heart rate less than or equal to 60 beats/minute is called bradycardia. c. a heart rate greater than or equal to 100 or 120 beats/minute is called tachycardia. d. a person’s heart rate will change depending on the needs of the body. e. b, c, and d are all correct.

Red–green color blindness is an x-linked recessive trait in humans. polydactyly (extra fingers and toes) is an autosomal dominant trait. martha has normal fingers and toes and normal color vision. her mother is normal in all respects, but her father is color blind and polydactylous. bill is color blind and polydactylous. his mother has normal color vision and normal fingers and toes. if bill and martha marry, what proportions of children with specific phenotypes would they be expected to produce? the answers only include the proportions of some of the possible phenotypes; other phenotypes are also expected to occur but are not included.