AP BIOLOGY

EVOLUTION

PATTERNS OF EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
T9. Evolution can occur at different rates; however, for evolution to occur, there must be:
A
variations within a species
B
extinction of the species
C
asexual reproduction
D
no change in the genes of an organism
Explanation: 

Detailed explanation-1: -Genetic Variation is Essential for Evolution by Natural Selection. For natural selection to occur, a population must have a wide variety of individuals with different traits.

Detailed explanation-2: -These rates vary among both genes and lineages due to gene effects (such as nucleotide composition, among-site variation, etc.), lineage effects (generation time, metabolic rates, etc.), and interactions between the two.

Detailed explanation-3: -Different genes often have different evolutionary rates. Even in a single gene, the evolutionary process is heterogeneous among sites. Rates also vary among lineages.

Detailed explanation-4: -Genetic variation is the presence of differences in sequences of genes between individual organisms of a species. It enables natural selection, one of the primary forces driving the evolution of life.

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