Geographically isolated population can evolve pre-zygotic or post-zygotic isolating mechanisms through natural selection or genetic drift
a. true
b. false
Answer: a. true
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Under normal healthy circumstances, the lymphatic system filters any microorganisms present.
Answer the following statement true (T) or false (F)
Animals that possess homologous structures probably _____.
A) are headed for extinction B) have a common ancestor C) have increased genetic diversity D) by chance had similar mutations in the past E) are not related
What is gene regulation?
A. Mechanisms that turn on and off mitosis in the cell cycle B. Mechanisms that regulate the replication of DNA C. Mechanisms that regulate which genes get copied D. Mechanisms that turn on and off specific genes to change which proteins are made
In the study of Gigord and colleagues using Elderflower orchids, the allele frequencies of yellow and purple flowers varied such that when the yellow allele started to become rare, the reproductive success of purple flowers decreased and the
reproductive success of yellow-flowered individuals increased in a process known as ________. A) overdominance B) frequency-dependent selection C) underdominance D) Hardy-Weinberg stabilization E) frequency depression