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Which of the following events is part of macroevolution?a. speciationb. mutationc. gene flowd. natural selectione. All of these are correct.
A biological speciesa. always looks different from other species.b. always has a different chromosome number than that of other species.c. is reproductively isolated from other species.d. never occupies the same niche as other species.e. does not survive long in the wild.
Which of these is a prezygotic isolating mechanism?a. habitat isolationb. temporal isolationc. hybrid sterilityd. zygote mortalitye. Both a and b are correct
Male moths recognize females of their species by sensing chemical signals called pheromones. This is an example ofa. gamete isolation.b. habitat isolation.c. behavorial isolation.d. mechanical isolation.e. temporal isolation.
Which of these is an example of mechanical isolation?a. Sperm cannot reach or fertilize an egg.b. Courtship patterns differ.c. Organisms live in different locales.d. Organisms reproduce at different times of the year.e. Genitalia are unsuitable to each other.
Complete the following diagram illustrating allopatric speciation by using these phrases: genetic changes (used twice), geographic barrier, species 1, species 2, species 3.
The creation of new species due to geographic barriers is calleda. isolation speciation.b. allopatric speciation.c. allelomorphic speciation.d. sympatric speciation.e. symbiotic speciation.
The many species of Galápagos finches are each adapted to eating different foods. This is the result ofa. gene flow.b. adaptive radiation.c. sympatric speciation.d. genetic drift.e. All of these are correct
Allopatric, but not sympatric, speciation requiresa. reproductive isolation.b. geographic isolation.c. spontaneous differences in males and females.d. prior hybridization.e. rapid rate of mutation.
Which of the following are an example of analogous structures?a. wings of birds and batsb. hooves of horses and deerc. wings of moths and butterfliesd. leaves on oak trees and maplese. arms of primates and cats
Which of the following is not part of the gradualistic model of evolution?a. isolation of the populationb. a slow change of the populationc. the presence of fossilsd. an ancestral population that gives rise to two separate populationse. a period of rapid change
A change in expression of the Tbx5 gene can lead to which of the following problems?a. malformation of the legsb. incorrect development of the eyec. lack of development of neck vertebrae in a snaked. development of six legs in a grasshoppere. a shorter dorsal spine in stickleback fish
Which gene is incorrectly matched to its function?a. Hox—body shapeb. Pax6—body segmentationc. Tbx5—limb developmentd. Pitx1—pelvic-fin developmente. All of these choices are correctly matched.
Which statement about speciation is not true?a. Speciation can occur rapidly or slowly.b. Developmental genes can account for rapid speciation.c. The fossil record gives no evidence that speciation can occur rapidly.d. Speciation always requires genetic changes, suc
In the evolution of the modern horse, which of the following was the goal of the evolutionary process?a. large sizeb. single toec. change in tooth sized. change in tooth shapee. None of these are correct