____ is the process by which diverging populations undergo natural selection in favor of enhanced pre-zygotic isolation
Fill in the blank with the appropriate word.
Reinforcement
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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). Based on the principle of independent assortment 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. 3 yellow-eyed with thumbs: 1 red-eyed without thumbs.
All eukaryotes have a membrane-delimited nucleus.
Answer the following statement true (T) or false (F)
The exchange of gases between the lungs and the blood occurs by
A. filtration. B. osmosis. C. active transport. D. diffusion. E. ionic bonding.
If an F2 generation from a self-cross always yields offspring in a 3:1 phenotypic ratio, which of the following P crosses could have occurred?
A) aa × Aa B) AA × AA C) AA × aa D) aa × aa E) Aa × AA