In Mendel's garden peas, each cell in a pea plant has a total count of:
A. one allele for each gene.
B. two alleles for each gene.
C. one allele for each gene if it is a truebreeding
parent and two if it is an F1
offspring.
D. one allele for each gene if it has green
seeds and two if it has yellow seeds.
E. between one and four alleles for each
gene.
B
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Which trait is least consistent with evolution by sexual selection?
a. males are larger than females b. females actively choose superior males c. males often bear showy or defensive structures d. males gather and defend harems of females e. female queen bees are responsible for reproducing
Researchers studying an endangered lizard species find a successful population of the lizard in a certain area. The researchers determine that this population has reproduced primarily through parthenogenesis. What are the researchers likely to recommend to conservation officials who are trying to protect the species?
a) move the successful population to a different area where lizard populations are struggling b) remove all lizards from the wild and place them in a captive breeding program c) remove as many predators as possible from the area with the successful population d) try to prevent changes to the environment in the area with the successful population
The work of scientists usually begins with
A) drawing conclusions. B) careful observations. C) testing a hypothesis. D) creating experiments.
The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids B. methane gas and alcohols C. carbohydrates D. inorganic compounds