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Free Martin is due to...

Free Martin is due to

A

Sex reversal by gene

B

Environmental control of sex

C

Hormonal control of sex

D

Sex determination by chromosome

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Freemartin**: - Freemartin is a condition that occurs in female calves that are born twin to male calves. It is characterized by reproductive abnormalities in the female. 2. **Cause of Freemartin**: - The primary cause of Freemartin is hormonal control of sex. The presence of male hormones (androgens) from the male twin affects the development of the female twin, leading to the Freemartin condition. 3. **Role of Hormones**: - Hormonal control of sex involves the synthesis of sexual hormones, which is regulated by the pituitary gland. This gland produces gonadotropins, which stimulate the development of the male testicles and female ovaries. 4. **Evaluating the Options**: - **Option 1: Sex reversal by gene** - Incorrect, as Freemartin is not caused by genetic sex reversal. - **Option 2: Environmental control of sex** - Incorrect, as Freemartin is not influenced by environmental factors. - **Option 3: Hormonal control of sex** - Correct, as Freemartin is directly related to hormonal influences from the male twin. - **Option 4: Sex determination by chromosome** - Incorrect, as Freemartin is not solely determined by chromosomal factors. 5. **Conclusion**: - The correct answer is that Freemartin is due to hormonal control of sex.
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