Assertion :-An X-linked recessive trait shows transmission from carries male to female progeny.
Reason :- X-linked recessive trait shws non-criss-cross inheritance.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is Flase.
D. If both Assertion & Reason are false.

Answer

To analyze the assertion and reason provided in the question, we need to break down the concepts of X-linked traits and inheritance patterns.

### Step-by-Step Solution:

1. **Understanding X-linked Recessive Traits**:
- X-linked recessive traits are those that are carried on the X chromosome. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).
- For a male to express an X-linked recessive trait, he only needs one copy of the recessive allele because he has only one X chromosome. In contrast, a female must have two copies of the recessive allele (one on each X chromosome) to express the trait.

2. **Transmission from Male to Female Progeny**:
- Males can pass their X chromosome to their daughters (female progeny) but not to their sons (who inherit the Y chromosome from their father).
- Therefore, if a male is a carrier of an X-linked recessive trait, he can indeed pass the allele to his daughters. This means that daughters can be carriers of the trait even if they do not express it, as they have one normal X chromosome from their mother.

3. **Understanding Non-Criss-Cross Inheritance**:
- Criss-cross inheritance refers to the pattern where traits are passed from father to daughter and then from daughter to son. In the case of X-linked recessive traits, it is not strictly criss-cross because males do not pass their X-linked traits to their sons.
- Instead, the inheritance pattern is more straightforward: males pass their X-linked traits to daughters, and females pass X-linked traits to both sons and daughters.

4. **Evaluating the Assertion and Reason**:
- The assertion states that "An X-linked recessive trait shows transmission from carrier males to female progeny." This is true.
- The reason states that "X-linked recessive traits show non-criss-cross inheritance." This is also true, but it does not directly explain the assertion.
- Therefore, while both statements are true, the reason does not adequately support the assertion.

### Conclusion:
- The assertion is true, and the reason is true, but the reason does not explain the assertion. Thus, the correct answer is that both statements are true, but the reason is not a valid explanation for the assertion.

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