Your father is heterozygous for a recessive disorder. You know your mother has two "good" alleles. What is the
probability that you will have the disorder?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
ANSWER: a
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Noting that half of a population is between the ages of 7 and 10 illustrates which of the following?
a. an r-selection graph b. a k-selection graph c. an age structure d. a growth curve
cephalization refers to the trend for animals with more complex body types to
A. concentrate nervous tissue in the anterior (head) end of the animal. B. become bilaterally symmetrical. C. develop a brain with clear divisions between "gray" and "white" matter. D. develop a segmental organization to the nervous system. E. concentrate sensory organs in the anterior end of the animal.
You discover a fungus that makes mainly asexual spores, but that occasionally makes sexual spores. When produced, the sexual spores come out of a thickened, hardened structure. A close examination of hyphae of this fungus reveals no septa. Into which group should you classify this fungus?
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
Karyo types generally remain constant within a species because
A) rearrangements occur frequently. B) changes in chromosome number occur infrequently. C) genetic instabilities produced by genomic changes are usually at a selective disadvantage. D) genetic imbalances are often at a selective advantage.