Natural selection occurs so an organism can become perfectly adapted to its environment
Indicate whether the statement is true or false
FALSE
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____ would produce the smallest evolutionary change in a given period of time in a population of birds.
A. Mutation B. Migration C. Gene flow D. Assortive mating E. Natural selection
If goats are crossed with sheep, embryos will form but cease development and spontaneously abort. This is an example of
A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. spermatic behavior.
In autumn, the leaves of deciduous trees change colors. This is because chlorophyll is degraded and _____
A) carotenoids and other pigments are still present in the leaves B) the degraded chlorophyll changes into many other colors C) water supply to the leaves has been reduced D) sugars are sent to most of the cells of the leaves
Transcription produces which of the following?
a. mRNA b. rRNA c. tRNA d. mRNA and tRNA e. mRNA and rRNA f. mRNA, tRNA, and rRNA are all produced by transcription.