________ are essential for one stage of the Schistosoma life cycle.
a) Rodents
b) Mosquitoes
c) Snails
d) Cats
Ans: c) Snails
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Cliff has colorblindness and icthyosis, which causes scaly skin. Both traits are X-linked recessive. The probability that he transmits both traits to his sons is
A) 0 B) 1/4 C) 1/2 D) 3/4
In ________ mimicry, two or more unrelated but protected species resemble one another, thus achieving a kind of group defense.
A. Batesian B. disruptive C. Müllerian D. cooperative
Unequal crossing over during prophase I can result in one sister chromosome with a deletion and another with a duplication. A mutated form of hemoglobin, so-called hemoglobin Lepore, exists in the human population
Hemoglobin Lepore has a deleted series of amino acids. If this mutated form was caused by unequal crossing over, what would be an expected consequence? A) There should also be persons whose hemoglobin contains two copies of the series of amino acids that is deleted in hemoglobin Lepore. B) Each of the genes in the hemoglobin gene family must show the same deletion. C) The deleted gene must have undergone exon shuffling. D) The deleted region must be located in a different area of the individual's genome.
Humans still have body hair even though it is greatly reduced and serves little function. The hair is a(n)
A) analogous structure. B) vestigial structure. C) mutation. D) homologous structure. E) adaptation.