Since males have only one X chromosome, the allele frequency of an X-linked trait is equal to the number of males with the recessive phenotype
a. True
b. False
Indicate whether the statement is true or false
True
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Which hormone(s) directly prepare(s) and
maintain(s) the uterine lining for pregnancy? a. estrogen b. progesterone c. follicle-stimulating hormone d. luteinizing hormone e. both estrogen and progesterone
Chthamalus stellatus and Semibalanus balanoides do not coexist in the same tidal zones because
A. C. stellatus outcompetes S. balanoides. B. S. balanoides outcompetes C. stellatus. C. The two species require different resources. D. S. balanoides preys on C. stellatus.
________ prevent hybrid offspring from developing or if the hybrid is born, it is infertile.
A. Two of these are correct. B. Prezygotic reproductive isolating mechanisms C. Temporal isolation mechanisms D. Postzygotic isolating mechanisms E. None of the answer choices are correct.
Which of the following is the best explanation for the inability of a specific animal cell to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid?
A) blockage of the synaptic signal B) loss of transcription factors C) insufficient ATP levels in the cytosol D) low levels of protein kinase in the cell