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State which of the following is not true...

State which of the following is not true.
A. Dominance is an autonomous feature of a gene or the product that it has information for.
B. A single gene product may produce only one effect.
C. Blood group AB is an example of codominance.
D. More than two alleles exist in a population for a single gene.

A

C and D

B

A and C

C

B and D

D

A and B

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the following statements is not true, we will analyze each statement one by one. ### Step 1: Analyze Statement A **Statement A:** Dominance is an autonomous feature of a gene or the product that it has information for. - **Explanation:** The term "autonomous" means independent. In genetics, dominance refers to the relationship between alleles, where one allele can mask the expression of another. Dominance is not an independent feature because it can vary depending on the context, such as the presence of other alleles or environmental factors. Therefore, this statement is **not true**. ### Step 2: Analyze Statement B **Statement B:** A single gene product may produce only one effect. - **Explanation:** This statement is incorrect because of the concept of pleiotropy, where a single gene can affect multiple traits or produce multiple effects. For example, the gene responsible for phenylketonuria affects various systems in the body, leading to multiple symptoms. Thus, this statement is also **not true**. ### Step 3: Analyze Statement C **Statement C:** Blood group AB is an example of codominance. - **Explanation:** This statement is true. In blood group AB, both A and B alleles are expressed equally, which is the definition of codominance. Therefore, this statement is **true**. ### Step 4: Analyze Statement D **Statement D:** More than two alleles exist in a population for a single gene. - **Explanation:** This statement is also true. For example, in the ABO blood group system, there are three alleles (I^A, I^B, and i) that determine blood type. Therefore, this statement is **true**. ### Conclusion After analyzing all statements, we find that statements A and B are not true, while statements C and D are true. Therefore, the correct answer is that the statements that are not true are **A and B**. ### Final Answer: **A and B are not true.** ---
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