If a person has short stature, a fold in the eyelids, fissured tongue, and mental impairment, they have
A) cri du chat syndrome.
B) Down syndrome.
C) fragile X syndrome.
D) Turner syndrome.
E) Klinefelter syndrome.
Ans: B) Down syndrome.
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In angiosperms, where does pollen production take place?
a. megasporangium b. antipodal cells c. microsporangium d. synergid cells
During, or shortly after a meal, most cells use which of the following as a source of energy?
a. fat b. amino acids c. glucose d. glycogen e. minerals
Darwin's geometric ratio of increase pertains specifically to
A. the inheritable variations found in a population. B. the inheritance of acquired traits. C. the overproduction potential of a species. D. the artificial selection of traits in plants or animals.
Assume that A and B are two linked genes on an autosome in Drosophila. A testcross is made where AB/ab flies are crossed to ab/ab flies and the progeny are counted and shown below. However, it is known that the Aa/bb genotype is lethal before the flies hatch and does not appear among the testcross progeny counted. What is the most precise map distance between the two genes that can be calculated from these data?
A. 50 m.u. B. 4.0 m.u. C. 16.4 m.u. D. 8.0 m.u. E. 4.2 m.u.