What would the results of a test cross yield for questionable parent that is hom

Question

What would the results of a test cross yield for questionable parent that is homozygous dominant; what about a questionable parent that is heterozygous?

What are the phenotypic rations of the offspring for a parent that is heterozygous for two traits, and a second parent that is homozygous dominant for one trait and homozygous recessive for the second trait?

What is the probability of getting a recessive phenotype when one parent is homozygous dominant and the second parent is heterozygous?

What is a carrier of a genetic disorder? What are the results of a cross between two carriers? If these genes are carried on autosomes, how do the results relate to the sex of the offspring?

Explanation / Answer

Answer:

1). All progeny would be dominant if the questionable parent is homozygous dominant

TT (homozygous dominant)X (tester would be homozygous recessive) tt----Test cross

Tt (all progeny would be heterozygous dominant)

2). 50% progeny would be dominant & the remaining 50% progeny would be recessive, if the questionable parent is homozygous dominant.

Tt x tt--Test cross

3).

heterozygous for two traits X   homozygous dominant for one trait and homozygous recessive for the second trait

AaBb X AAbb

Aabb

Dominant for both traits (2) : Dominant for one trait and recessive for second trait (2)

1 : 1

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