Most eukaryotic genes contain noncoding sequences called ________ that are interspersed with the coding sequences.
A. introns
B. exons
C. codons
D. spacers
E. spliceosomes
A. introns
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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.
In keeping with Mendel's law of independent assortment, an individual heterozygous for two traits can form _____ types of gametes.
Fill in the blank(s) with the appropriate word(s).
Antiviral medications frequently block unique (proteins/enzymes/molecules) to prevent production of a new virus
What will be an ideal response?
In the cyclic electron pathway of the light reactions, electrons energized by the sun leave photosystem I and enter
What will be an ideal response?