Assertion :-An X-linked recessive trait shows transmission from carries male to female progeny.
Reason :- X-linked recessive trait shows 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 true 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 will break down the concepts of X-linked recessive traits and their inheritance patterns step by step.

### Step 1: Understanding the Assertion
The assertion states that "An X-linked recessive trait shows transmission from carrier male to female progeny."

- In X-linked inheritance, males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).
- A male can carry an X-linked recessive trait if he has the recessive allele on his single X chromosome (X^cY).
- When a carrier male (X^cY) has offspring with a female (XX), he can pass on his X chromosome (X^c) to his daughters.

### Step 2: Analyzing the Assertion
- If the carrier male (X^cY) has a daughter, she will receive one of his X chromosomes (X^c) and one X chromosome from her mother (X).
- This means the daughter will be a carrier (X^cX) but not affected by the trait because she has one normal allele (X).
- Therefore, the assertion is true: a carrier male can transmit the X-linked recessive trait to female progeny, making them carriers.

### Step 3: Understanding the Reason
The reason states that "X-linked recessive trait shows non-criss-cross inheritance."

- In criss-cross inheritance, traits are passed from male to female and then from female to male.
- For X-linked traits, the inheritance pattern typically follows criss-cross inheritance: affected males pass their X chromosome to daughters, and affected females pass their X chromosome to sons.
- Thus, X-linked recessive traits do show criss-cross inheritance.

### Step 4: Analyzing the Reason
- Since X-linked recessive traits do exhibit criss-cross inheritance, the reason provided is false.
- Therefore, the reason does not correctly explain the assertion.

### Conclusion
Based on the analysis:
- The assertion is true: a carrier male can transmit the X-linked recessive trait to female progeny.
- The reason is false: X-linked recessive traits do show criss-cross inheritance.

### Final Answer
Both the assertion (A) is true, and the reason (R) is false.