The process of exon shuffling for the origin of new genes is supported by the evidence that
a. exons evolve more slowly than introns do.
b. unicellular eukaryotic genes have fewer exons than multicellular eukaryotic genes.
c. different genes have related exons.
d. very few prokaryotic genes have introns.
e. duplicated genes often have exons in a different sequence than the original copy of the gene.
Ans: c
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In Lake Victoria, hundreds of cichlid fish species arose after the lake last dried up 12,400 years ago. This is an
example of ____.
a. sympatric speciation b. the founder effect c. gene flow d. genetic drift e. allopatric speciation
In a survey of 240,000 human births, 6 achondroplastic births were recorded to parents who were unaffected. Given that this form of dwarfism is caused by a fully penetrant, dominant, autosomal gene, what is the mutation rate?
What will be an ideal response?
Approximately half of known animal carcinogens can be detected by the Ames test.
Answer the following statement true (T) or false (F)
Standing out in center field, the baseball player watches the hitter's bat strike the ball and then, slightly later, hears the sound of the impact. What types of sensory receptors did the player just use?
A) thermoreceptors and chemoreceptors B) photoreceptors and mechanoreceptors C) chemoreceptors and pain receptors D) pain receptors and thermoreceptors