What processes have been hypothesized to influence the evolution of mutation rates?
A) natural selection only
B) genetic drift only
C) both natural selection and genetic drift, acting in the same direction to either increase or decrease mutation rates
D) both natural selection and genetic drift, acting in opposing directions: one process favors increasing mutation rates and the other favors decreasing mutation rates
D
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An embryo that is composed of a hollow ball of cells is called a blastocyst
a. True b. False Indicate whether the statement is true or false
What type of thinking is required?
What will be an ideal response?
In a 3-D double helix model of DNA, the center consists of ____
a. deoxyribose sugars b. hydrogen bonds c. nucleotide base pairs d. phosphate groups e. sugar–phosphate backbones
Which of these is a major trend in land plant evolution?
A) the trend toward smaller size B) the trend toward a gametophyte-dominated life cycle C) the trend toward a sporophyte-dominated life cycle D) the trend toward larger gametophytes