Why do related species share homologous traits?
A. Related species have independently evolved similar traits.
B. Related species inherited homologous traits from a common ancestor.
C. Homologous traits are the products of divergent evolution.
D. Related species have adapted to similar environments.
Ans: B. Related species inherited homologous traits from a common ancestor.
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In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision whose father was color blind marries a man who also has normal color vision
He has brown eyes, but his mother had blue eyes. Which of the following would you expect to be true for their sons? A) One-half of their sons will have normal color vision and brown eyes; 1/2 of their sons will have normal color vision and blue eyes. B) Their sons will all have normal color vision and brown eyes. C) One-fourth of their sons will be color blind and have blue eyes, 1/4 of their sons will be color blind and have brown eyes, 1/4 of their sons will have normal color vision and blue eyes, 1/4 of their sons will have normal color vision and brown eyes. D) Their sons will all have normal color vision and blue eyes. E) One-half of their sons will be color blind and have blue eyes; 1/2 their sons will be color blind and have brown eyes.
Sperm
(a) are male gametes. (b) are female gametes. (c) contain yolk. (d) are produced in the ovaries.
What is the most common class of molluscs?
a. Chitons b. Gastropods c. Bivalves d. Cephalopods
How many more people could be fed on one pound of grain than one pound of meat?
A. 5 times B. 10 times C. 3 times D. 20 times E. 2 times