Why is reproductive isolation central to the biological species concept?
What will be an ideal response?
The biological species concept defines species in terms of population genetics and evolutionary theory
based on ability to interbreed. Two different reproductive isolating mechanisms are recognized,
prezygotic and postzygotic, which are, respectively, premating and postmating mechanisms.
Reproductive isolation prevents gene pools of two species from mixing.
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A consensus sequence in the untranslated leader sequence of a prokaryotic mRNA, which serves as a ribosome binding site is called the ________ sequence.
Fill in the blank(s) with the appropriate word(s).
The ____ ion is required for ribozymes to become active and begin self-replication
a. ferrous iron b. ferric iron c. zinc d. magnesium Chapter 25 - The Origin of Life Cengage Learning Testing, Powered by Cognero Page 6 e. selenium
Crossing over occurs during ________ and is important because it ________
A) prophase I; generates variation B) metaphase I; reduces the chromosome number by half C) anaphase II; separates the homologous pairs D) telophase II; creates daughter cells
All of the following are true about prosimians except
A. they are nocturnal. B. they are big-eyed mammals with increased visual acuity. C. they are widespread. D. only two lineages survive today.