Feather color in budgies is determined by two different genes, Y and B, one for pigment on the outside and one for the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. A blue budgie is crossed with a white budgie. Which of the following results is NOT possible?
A) green offspring only
B) yellow offspring only
C) blue offspring only
D) green and yellow offspring
E) a 9:3:3:1 ratio
Answer: D
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The X and Y chromosomes ____
a. are responsible for autosomal recessive inheritance b. will lead to color-blindness in all carriers c. are found paired with all 22 autosomal chromosomes d. are responsible for albinism e. play major roles in determining the sex of an individual
Most brown algae start life attached to rocks; a notable exception is:
a. giant kelp. b. North Atlantic Sargassum. c. feather boa kelp. d. Laminaria. e. Fucus.
Among known plant species, which of these have been the two most commonly occurring phenomena that have led to the origin of new species?
A) allopatric speciation and sexual selection B) allopatric speciation and polyploidy C) sympatric speciation and sexual selection D) sympatric speciation and polyploidy
Humans are an example of ____
a. bulk feeders b. deposit feeders c. fluid feeders d. suspension feeders e. bulk and fluid feeders