Two nuclei are formed during
A. prophase I.
B. metaphase I.
C. anaphase I.
D. telophase I.
D. telophase I.
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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
Salmonella are ________.
A. gram-positive bacilli B. methane producers C. lactose fermenters D. motile E. All of the choices are correct.
A researcher returns from the Amazon River with 10 individuals of a species of fish and establishes a small breeding colony in her laboratory
She maintains the colony for several years (many fish generations), always maintaining the number of adult fish between 10 and 30. She notices that as generations of fish are bred, the reproductive rate decreases. What is the most likely reason for this? A) inbreeding depression B) increased genetic variability C) random mutations D) heterozygote advantage
Most of the dry weight of a plant is the result of uptake of
a) CO2 through stoma. b) water and minerals through mycorrhizae. c) CO2 and O2 through stomata in leaves. d) carbohydrates in the root hairs and concentration in the root cortex. e) water and minerals through root hairs.