Use the Following to Answer Questions

question 27

Multiple Choice

Use the following to answer questions :
In dogs,phenotype A (erect ears and barking while following a scent) is caused by dominant alleles;phenotype B (droopy ears and silent while following a scent) is caused by recessive alleles.A dog that is homozygous for both traits of phenotype A is mated to a dog with phenotype B.
-If the genes for the two traits are unlinked,and the F₁ generation is crossed,what is the expected phenotypic ratio of the F₂ generation?

• A) 9:3:3:1 (A:erect silent:droopy barking:B)
• B) 1:1 (A:B)
• C) 1:0 (A:B)
• D) 1:2:1 (A:erect silent:B)
• E) 4:1 (A:B)

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