Animal breeders use a _______ to determine whether an organism is heterozygous or homozygous for a particular trait.
a. Punnett square
b. reciprocal cross
c. test cross
d. self cross
c. test cross
Animal breeders use a test cross to determine whether an organism is heterozygous or homozygous for a particular trait.
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While cataloging fish living in a nearby lake, you find an example of a species that you initially mistake for a hagfish, but further inspection shows that it has a true cerebellum, a rudimentary vertebral column parallel to its notochord, and eggs that are fertilized externally. To what class of fish does this species belong?
a. Chondrichthyes b. Myxini c. Petromyzontida d. Osteichthyes
A triglyceride molecule is made up of
a. one glycerol and two fatty acids. b. two fatty acids and two glycerols. c. one fatty acid and three glycerols. d. one glycerol and three fatty acids. e. any of these
Which of the following female organisms contain two different sex chromosomes?
a. humans b. fruit flies c. cows d. butterflies e. cats
Which of the following is an important feature of the scientific method
a) a good hypothesis b) if research results are not conclusive, the opinion of experts should be relied upon c) anyone should be able to repeat an experiment d) a researcher's methods should not be described once desired results have been obtained e) once demonstrated, conclusions cannot be changed