The most important quantity necessary for life to form appears to be the existence of ____________ on the surface of the planet
Fill in the blank(s) with correct word
liquid water
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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) for paws with thumbs and the recessive allele (t) for paws without thumbs. The genetic cross RRTT x rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt x 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.
Mendel called a trait that is masked
a) homozygous. b) heterozygous. c) dominant. d) recessive. e) None of the answers are correct.
The exchange of gases between the lungs and the blood occurs by
A. filtration. B. osmosis. C. active transport. D. diffusion. E. ionic bonding.
Coarse-textured soils have a low field capacity and a low wilting point
Indicate whether the statement is true or false