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The sperm and the egg make different con...

The sperm and the egg make different contributions to zygote which of the following statements about their contributions are true?
(i). Sperm contributes most of the mitochondria.
(ii). Egg contributes most of the cytoplasm.
(iii). Both sperm and egg contribute halpoid nucleus.
(iv). Both sperm and egg contribute centrioles.

A

(i) and (ii)

B

(ii) and (iii)

C

(iii) and (iv)

D

(i),(ii),(iii) and (iv)

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, let's analyze each statement step by step. ### Step-by-Step Solution: 1. **Statement (i): Sperm contributes most of the mitochondria.** - The sperm does contain mitochondria in its middle piece, which provides energy for its motility. However, during fertilization, only the sperm head enters the egg, and the mitochondria from the sperm do not contribute to the zygote. Therefore, this statement is **false**. 2. **Statement (ii): Egg contributes most of the cytoplasm.** - The egg (ovum) is significantly larger than the sperm and contains a substantial amount of cytoplasm. This cytoplasm is crucial for the initial stages of development after fertilization. Thus, this statement is **true**. 3. **Statement (iii): Both sperm and egg contribute haploid nucleus.** - Both the sperm and the egg are gametes, and they each contain a haploid nucleus (23 chromosomes in humans). When they fuse during fertilization, they form a diploid zygote (46 chromosomes). Therefore, this statement is **true**. 4. **Statement (iv): Both sperm and egg contribute centrioles.** - The sperm contributes centrioles, which are important for cell division, but the egg does not contribute centrioles. The egg typically lacks centrioles and relies on the sperm for this function. Hence, this statement is **false**. ### Summary of True Statements: - The true statements are: - (ii) Egg contributes most of the cytoplasm. - (iii) Both sperm and egg contribute haploid nucleus. ### Final Answer: The true statements about the contributions of sperm and egg to the zygote are (ii) and (iii). ---
To determine which statements about the contributions of sperm and egg to the zygote are true, let's analyze each statement step by step. ### Step-by-Step Solution: 1. **Statement (i): Sperm contributes most of the mitochondria.** - The sperm does contain mitochondria in its middle piece, which provides energy for its motility. However, during fertilization, only the sperm head enters the egg, and the mitochondria from the sperm do not contribute to the zygote. Therefore, this statement is **false**. 2. **Statement (ii): Egg contributes most of the cytoplasm.** ...
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