A population becomes isolated from other populations of the same species, and then genetic divergence occurs that prevents them from breeding with other populations. What has happened?
A) directional selection B) formation of genetic drifts
C) mechanical incompatibility D) speciation
Answer: D
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Shine–Delgarno sequences are present in mRNAs of
A) prokaryotes. B) eukaryotes. C) fungi. D) algae. E) mosses.
During inspiration (a.k.a. inhalation) of air into the lung of a mammal
A. the chest cavity has a positive pressure. B. the diaphragm moves upward. C. the diaphragm contracts. D. the rib cage moves down. E. the intercostal muscles relax.
Through meiosis
a. alternate forms of genes are shuffled. b. parental DNA is divided and distributed to forming gametes. c. the diploid chromosome number is reduced to haploid. d. offspring are provided with new gene combinations. e. all of these occur.
Which of the following pairs are the best examples of homologous structures?
A) bones in the bat wing and bones in the human forelimb B) owl wing and hornet wing C) bat wing and bird wing D) eyelessness in the Australian mole and eyelessness in the North American mole