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The sperm and the egg make different con...

The sperm and the egg make different contributions to zygote. What statement/ statements about their contributions is / are true?
A. Sperm contribute most of the mitochondria
B. Egg contribute most of the cytoplasm
C. Both sperm and egg contribute haploid nucleus
D. Both sperm and egg contribute centrioles

A

A, B

B

B, C

C

C, D

D

A, B, C, D

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about the contributions of sperm and egg to the zygote are true, we will analyze each statement step by step. ### Step-by-Step Solution: 1. **Understanding the Contributions of Sperm and Egg**: - The sperm (male gamete) and egg (female gamete) each contribute to the formation of a zygote when they fuse during fertilization. 2. **Analyzing Statement A**: - **Statement**: "Sperm contribute most of the mitochondria." - **Analysis**: Mitochondria are primarily located in the cytoplasm. The egg is larger than the sperm and contains more cytoplasm, thus it contributes most of the mitochondria to the zygote. Therefore, this statement is **incorrect**. 3. **Analyzing Statement B**: - **Statement**: "Egg contributes most of the cytoplasm." - **Analysis**: The egg is significantly larger than the sperm and contains a substantial amount of cytoplasm. Thus, this statement is **correct**. 4. **Analyzing Statement C**: - **Statement**: "Both sperm and egg contribute haploid nucleus." - **Analysis**: Both the sperm and the egg are haploid, meaning they each contain one set of chromosomes. When they fuse, they contribute their haploid nuclei to form a diploid zygote. Therefore, this statement is **correct**. 5. **Analyzing Statement D**: - **Statement**: "Both sperm and egg contribute centrioles." - **Analysis**: The sperm contributes centrioles necessary for cell division, while the egg does not contribute centrioles. The egg undergoes an incomplete division during fertilization, and thus this statement is **incorrect**. ### Conclusion: The true statements about the contributions of sperm and egg to the zygote are: - **B**: Egg contributes most of the cytoplasm. - **C**: Both sperm and egg contribute haploid nucleus. ### Final Answer: The correct options are **B and C**. ---
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