Which of the following is a genetic mutation that affects males more than females?
A. nearsightedness
B. red-green color blindness
C. farsightedness
D. astigmatism
E. blindness
Answer: B
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In cats an X-linked pair of alleles, B and b, controls color of fur. The alleles are incompletely
dominant: B produces black, b produces yellow, and Bb produces tortoise-shell. (a) A yellow cat had a litter of two tortoiseshell kittens and one yellow. What is the sex of the yellow kitten? (b) A tortoiseshell cat brings home a litter of black, yellow, and tortoiseshell kittens. The color of which sex would tell you the color of the tomcat that produced them? (c) A yellow male is crossed with a tortoiseshell female. If the female has all male kittens in her litter of four, what color(s) would they be? (d) A tortoiseshell cat brings home her litter of black, yellow, and tortoiseshell kittens. By what method could you possibly decide whether the male parent was the black tomcat next door? What will be an ideal response?
What evidence exists that suggests modern agriculture is unsustainable?
A) Fresh water is used for irrigating crops. B) Large amounts of nonrenewable fossil fuels are required. C) Fertilizers and pesticides are inexpensive and easy to obtain. D) More food is produced than can be used.
Which of the following is true of iron sources and functions?
a. The only dietary sources of iron are meat, fish, and poultry. b. Myoglobin and hemoglobin contain equal amounts of iron. c. Heme iron is always better absorbed than non-heme iron. d. The body cannot recycle iron for other uses.
Which species concept distinguishes two species by the degree of genetic exchange between their gene pools?
a. Ecological b. Morphological c. Phylogenetic d. Biological e. All of the listed responses are correct.