Suppose your mother has albinism, which is a recessive trait. Suppose also that your father has cystic fibrosis, which is also caused by a recessive trait. And, you learn that your father-in-law has albinism and cystic fibrosis. What are the odds that your first child will have both albinism and cystic fibrosis?
a. 1 in 2
b. 1 in 4
c. 1 in 8
d. 1 in 16
Ans: d. 1 in 16
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Some evidence that algae are the closest relative to plants is that they both:
a. Have chloroplasts b. Contain chlorophyll a c. Have cellulose rich cell walls d. Use starch as a nutrient reserve e. All are correct
In mice, the allele for colored fur (C) is dominant to the allele for albinism (c). The allele (W) for
normal behavior is dominant to that for waltzing movement (w). Give the probable genotypes of the parents if they produced the offspring listed after the following crosses: (a) Colored normal ? white waltzer produced 10 colored normal, 8 colored waltzers, 2 white waltzers, and 11 white normal. (b) Colored normal ? white normal produced 35 colored normal and 13 colored waltzers. (c) Colored normal ? colored normal produced 37 colored normal, 14 colored waltzers, 9 white normal, and 5 white waltzers. What will be an ideal response?
Recessive disorders related to genes found on the X chromosome but not on the Y are more commonly expressed in ________
A) children B) adults C) females D) males
Tropical climates are warmer than temperate climates because
A. temperate climates are closer to the poles and the polar surfaces cause a reduction in heat gain. B. tropical climates have more vegetation and thus can absorb more heat. C. tropical climates receive the sun's rays at an almost perpendicular angle; since Earth is a sphere, the temperate climates receive the sun's rays at a much steeper incidence thus spreading the radiation over a broader area. D. tropical climates receive the sun's rays at a much steeper incidence thus spreading the radiation over a broader area and causing the tropics to be warmer while the temperate climates receive the sun's rays at an almost perpendicular angle, which causes some areas to be warm and other areas to be cold. E. temperate climates have more mountains and thus more snow causing the landmasses to warm slower.