If Darwin had been aware of genes and their typical mode of transmission to subsequent generations, with which statement would he most likely have been in agreement?
A) If natural selection can change gene frequency in a population over generations, given enough time and genetic diversity, then natural selection can cause sufficient genetic change to produce new species from old ones.
B) If an organism's somatic cell genes change during its lifetime, making it more fit, then it will be able to pass these genes on to its offspring.
C) If an organism acquires new genes by engulfing, or being infected by, another organism, then a new genetic species will result.
D) A single mutation in a single gene in a single gamete, if inherited by future generations, will produce a new species.
A
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Which of the following linkage maps correctly shows the order and distance between the px, sp, and cn genes?
Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations. The offspring are as follows:
A) sp——0.21 m.u.——px——30.01 m.u.——cn
B) sp——30.01 m.u.——px——0.21 m.u.——cn
C) sp——0.2 m.u.——px——30 m.u.——cn
D) px——0.2 m.u.——sp——30.2 m.u.——cn
E) px——30.2 m.u.——sp——0.2 m.u.——cn
Like plants, and unlike most other green algae, ____ cells divide their cytoplasm by cell plate formation and have plasmodesmata (cytoplasmic connections between neighboring cells)
a. Chlamydomonas b. Volvox c. charophyte d. sea lettuce e. Ulva
Both thermogenin and 2,4-dinitrophenol (DNP) uncouple oxidation from ATP synthesis. Thermogenin is expressed in the mitochondria of brown fat cells in newborn animals and adult mammals that hibernate
DNP was marketed in the 1930s as a diet pill, but in addition to causing weight loss it sometimes caused death. a. Compare the mechanisms by which these uncouplers affect ATP synthesis. b. What function does thermogenin serve for brown fat cells? c. Why is the rationale for DNP as a diet drug? d. Considering locations of the effects in an animal and the possibility for allosteric regulation, suggest why thermogenin is advantageous and DNP dangerous for humans?
Based on the outcome for plants, a monkey eating a banana is a
A. disperser. B. fertilizer. C. pollinator. D. parasite.