In a dihybrid cross ratio, what is the probability of getting the genotype aa when you cross genotypes Aa and aa?
A. 1/1
B. 1/8
C. 1/4
D. 1/2
D. 1/2
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Which one of the following is true of the sporophyte stage of a flowering plant?
A. It is haploid. B. It is 1N. C. It is a nonphotosynthetic stage. D. It is the obvious stage such as an oak tree. E. It is dependent on the gametophyte for nutrition.
The seabirds with an ecological role similar to land-based hawks, falcons, and vultures are the:
a. gulls and terns. b. skuas and jaegers. c. avocets and sandpipers. d. curlews and turnstones. e. eiders and puffins.
Scientists may compare similar genes in different species and determine what percentage of base pairs is identical. From this, it can be estimated how long ago the two species shared a common ancestor. The validity of this conclusion depends on an
important assumption. This assumption is that: A) all living things use the same genetic code. B) both species belong to the same kingdom. C) the gene codes for a functional protein. D) mutations occur at a fairly constant rate in all evolutionary lines.
Which of the following statements is not true concerning bacteria and archaea?
a. Archaea and bacteria have different membrane lipids. b. Both archaea and bacteria generally lack membrane-enclosed organelles. c. The cell walls of archaea lack peptidoglycan. d. Only bacteria have histones associated with DNA. e. Only some archaea use CO2 to oxidize H2, releasing methane.