The number of individuals of a species per unit area or volume of habitat is
A. the population dynamics.
B. the carrying capacity.
C. the population density.
D. a community.
E. the population distribution.
C. the population density.
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For a complex trait that is observed less frequently in a given sex in a given family, the recurrence risk for this trait is ____________________ for future children of that sex
Fill in the blank(s) with correct word
You insert a fragment of sheep DNA into a plasmid containing an AmpR gene. You transform bacteria with the recombinant plasmid, and plate the cells on growth media containing the antibiotic ampicillin. Each colony on the plate arose from _____ that ____ to ampicillin.
A. a single bacterium; is sensitive. B. many bacteria; are sensitive. C. many bacteria; are resistant. D. a single bacterium; is resistant.
Approximately _____ of the gametes produced by an individual heterozygous for a translocation will be nonviable.
A. an eighth B. all C. a quarter D. none E. half
Pax6 is a transcription factor noted for its unique role in specifying eye development across the animal kingdom. A homologous gene known as eyeless specifies eyes in Drosophila, and misexpression of mouse Pax6 can cause ectopic eyes in flies! This creates a quandary - how can we explain the universality of the master regulatory gene for eye development, with the striking variability of eye anatomy in different phyla?Misexpression of the Pax6 gene was shown to promote eye development in both vertebrates and invertebrates. The authors of this study suggested that this was evidence that eyes evolved only once. What other evidence contradicts this view?
A. Invertebrates normally have only simple eyespots. B. The anatomical structure of insect, mollusk, and vertebrate eyes are quite different. C. Many different transcription factors can initiate eye development when misexpressed. D. While the anatomy of all animal eyes is the same, lens proteins vary greatly.