Some chickens have a dominant frizzle gene that leads to the development of feathers that curl
outward rather than lying flat against their bodies as in standard chickens. Aside from these
“frizzled feathers,” chickens with this dominant allele also tend to have higher metabolic rates
and produce fewer eggs than chickens that carry the recessive version of this gene. Thus, this
gene exhibits __________.
a. pleiotropy
b. polygenic inheritance
c. incomplete dominance
d. codominance
A
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Totipotent human stem cells can apparently be obtained only from:a
bone marrow. b. umbilical cords. c. cancer patients. d. zygotes. e. gametes
A couple has two female children. What is the probability that their next child will be male?
A) 25% B) 50% C) 33% D) 67%
How many kingdoms are there in the most current tree of life?
A.) Three B.) Two C.) Six D.) Five
Overexpression of caudal in the early Drosophila embryo, at a level high enough to overcome inhibition by Bicoid protein, would
A. interfere with the development of both anterior and posterior structures. B. interfere with the development of anterior structures. C. have no effect since the cytoplasm has already been determined. D. interfere with the development of posterior structures.