What fraction of your DNA is the same as every other human being?
a. 50%
b. 75%
c. 90%
d. 95%
e. 99%
ANSWER: e
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What type of sensory receptor is responsible for olfaction?
A. photoreceptor B. electroreceptor C. chemoreceptor D. nociceptor
A tidepool exposes organisms to all the following except:
a. desiccation. b. thermal stress. c. salinity changes. d. pH changes. e. dissolved oxygen changes.
In Down syndrome,
a. as the age of the mother increases, the chance of the defect occurring in the unborn children increases. b. the age of the father usually has an equal influence on the defect. c. most embryos abort before complete term. d. a person with the defect cannot have a normal child. e. 80% of trisomic 21 babies are born to women over the age of 40.
Cinnabar eyes is a sex-linked, recessive characteristic in fruit flies. If a female having cinnabar eyes is crossed with a wild-type male, what percentage of the F1 males will have cinnabar eyes?
A) 0% B) 25% C) 50% D) 100%