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A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive.
-In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (CRCr) offspring of red (CRCR) and white (CrCr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white?

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The roan coat color in cattle is a result of incomplete dominance, where heterozygotes (CRCr) have a phenotype that is intermediate between the two homozygous phenotypes (CRCR and CrCr). Therefore, the only cross that would produce offspring in the ratio of 1 red:2 roan:1 white would be a cross between two heterozygous roan (CRCr) individuals (B). The other crosses (A, C, and D) would not produce this ratio of offspring.

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