When the theory of evolution by natural selection was first presented in 1858, authorship was credited to both Charles
Darwin and ____.
a. Charles Lyell
b. Alfred Wallace
c. Georges Cuvier
d. Jean-Baptiste Lamarck
e. Thomas Malthus
ANSWER: b
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A patient in his forties is diagnosed with Huntington disease. The patient's mother is healthy and a genetic evaluation shows 25 and 26 CAG repeats within her HTT alleles
The patient's father died at age 24 when the patient was 2 and no genetic evaluation can be done. It is most likely that: A. the father was heterozygous for the defective HTT allele. B. the father was homozygous for the defective HTT allele. C. the mother is a carrier for the defective HTT allele. D. the HTT gene acquired additional CAG repeats during the 40 years of the patient's life.
The discharge of the electric organ of electric rays delivers up to 220 volts
Indicate whether the statement is true or false
Studies have shown that in the flowering plant Arabidopsis the development of parts of a flower is
governed by
a. differential uptake of hormone signals from the leaves. b. the oxygen gradient from outside to inside of the closed flower. c. differentiation of cell types as they are formed from the apical meristem. d. the timing of cell division. e. the expression patterns of several floral organ homeotic genes.
Mosquitoes have a short life span and produce a very large number of eggs. This is typical of a/an:
A) density dependent species. B) K-selected species. C) r-selected species. D) equilibrium species.