Naturally occurring mutations are often referred to as ________ mutations
A) neutral B) unnoticed C) spontaneous D) insertion E) deleterious
Answer: C
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Genetic studies of an animal show that eye color is controlled by an autosomal gene with the dominant
allele (R) for red eye color and the recessive allele (r) for yellow eye color. A second autosomal gene has the dominant allele (T) leading to paws with thumbs while the recessive allele (t) codes for paws without thumbs. The genetic cross RRTT ? rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt ? rrtt). If the two genes are completely linked (no recombination occurs between them), then the testcross should produce offspring with the phenotype ratio
a. 3 red-eyed with thumbs: 1 yellow-eyed without thumbs. b. 1 red-eyed with thumbs: 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs. c. 1 red-eyed with thumbs: 1 yellow-eyed without thumbs. d. 9 red-eyed with thumbs: 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs. e. 1 yellow-eyed with thumbs: 1 red-eyed without thumbs.
Recombinant vectors are often propagated in bacterial cells. Indicate whether the statement is true or false
Action potentials occur when the transmembrane potential of a neuron reaches threshold. Where is the action potential initiated on the neuron?
a. Dendrite b. Soma c. Axon hillock d. Axon
Crocodiles are living representatives of which lineage?
a. archosaurs b. lepidosaurs c. synapsids d. anapsids