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In corn, the trait for a tall plant (T) ...

In corn, the trait for a tall plant (T) is dominant to the trait for a dwarf plant (t) and the trait for coloured kernels (C ) is dominant to the trait for white kernels (c ). In a particular cross of corns, probability of white kernels is 0.25 and the probability of a kernel being coloured is 0.75 which of the following most probably represnts the parental genotypes?

A

`TtCc xx TtCc`

B

`TtCc xx t tCc`

C

`TtCc xx t t c c`

D

`T TCc xx t tCc`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to determine the parental genotypes that result in a 75% probability of colored kernels (C) and a 25% probability of white kernels (c) in corn. ### Step-by-Step Solution: 1. **Understanding Dominance**: - The trait for tall plants (T) is dominant over dwarf plants (t). - The trait for colored kernels (C) is dominant over white kernels (c). 2. **Probability Analysis**: - The probability of white kernels (cc) is 0.25, which implies that the probability of colored kernels (C) is 0.75. This suggests a typical Mendelian ratio of 3:1 for a dominant-recessive trait. 3. **Identifying the Cross**: - Since we are dealing with two traits (plant height and kernel color), we will consider a dihybrid cross. - The expected phenotypic ratio for a dihybrid cross involving two heterozygous parents (TtCc x TtCc) is 9:3:3:1. 4. **Setting Up the Genotypes**: - To achieve a 3:1 ratio for kernel color, we can use the following parental genotypes: - Both parents should be heterozygous for kernel color (Cc). - The height trait can be either homozygous dominant (TT) or heterozygous (Tt). 5. **Choosing Parental Genotypes**: - Let's analyze the options provided in the question: - Option 1: TtCc x TtCc - Option 2: TtCc x ttCc - Option 3: TtCc x ttcc - Option 4: TTcc x ttcc - The only option that maintains the 3:1 ratio for kernel color while also allowing for variation in height is Option 1 (TtCc x TtCc). 6. **Conclusion**: - The most probable parental genotypes that result in the desired kernel color ratio of 75% colored (C) to 25% white (c) are both parents being heterozygous for both traits: **TtCc x TtCc**. ### Final Answer: The parental genotypes that most probably represent the desired outcome are **TtCc x TtCc** (Option 1).
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