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Which of the following statements is inc...

Which of the following statements is incorrect regarding sex determination in animals?

A

Grasshoppers , male = autosomes + XO, female - autosomes +XX

B

Drosophila, males = autosomes + XY, female = autosomes +XX

C

Birds , females = autosomes + ZW, males = autosomes + ZZ

D

Insects (XO type), all sperms = one set of autosomes + X

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement is incorrect regarding sex determination in animals, we need to analyze the provided statements about different organisms and their sex determination mechanisms. ### Step-by-Step Solution: 1. **Understand the Concept of Sex Determination**: - Sex determination in animals is primarily governed by sex chromosomes (also known as allosomes). These chromosomes can be either homologous (same) or heterologous (different). 2. **Identify Types of Heterogamy**: - **Male Heterogamy**: Males have two different sex chromosomes (e.g., XY in humans). Here, males determine the sex of the offspring. - **Female Heterogamy**: Females have two different sex chromosomes (e.g., ZW in birds). Here, females determine the sex of the offspring. 3. **Examine Each Statement**: - **Statement 1**: In grasshoppers, the sex determination is based on the XX/XY system (XX is female, XO is male). This is correct. - **Statement 2**: In Drosophila, the sex determination is based on the XX/XY system (XX is female, XY is male). This is also correct. - **Statement 3**: In birds, the sex determination is based on the ZZ/ZW system (ZZ is male, ZW is female). This statement is correct as well. - **Statement 4**: It states that all sperm in grasshoppers will have one set of autosomes plus one X chromosome. This is incorrect because, in grasshoppers, 50% of the sperm will have one set of autosomes and one X chromosome (XO), while the other 50% will have one set of autosomes and no sex chromosome (O). 4. **Conclusion**: - The incorrect statement regarding sex determination in animals is **Statement 4**. ### Final Answer: The incorrect statement regarding sex determination in animals is **Statement 4**.
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