Sexual reproduction is achieved when the gamete of a male organism unites with the gamete of a female organism to form a new and genetically unique cell. Each of the two gametes contributes equally to the genetic material found in the new cell's nucleus. However, the genetic material found in the new cell's cytoplasm (the part of a cell outside the nucleus) is contributed exclusively by the female's gamete. A certain type of genetic material, referred to as GM62, is found only in cytoplasm.
Which one of the following is a conclusion that can logically be drawn from the passage above?The passage says GM62 is found only in the cytoplasm, and the cytoplasm’s genetic material comes exclusively from the female gamete.
So GM62, if contributed to offspring, must come from the female organism.
(A) All female organisms contribute GM62 to their offspring.
Wrong. The passage does not say every female organism has GM62 or contributes it.
(B) Only female organisms can contribute GM62 to their offspring.
Correct. Since GM62 is found only in cytoplasm, and cytoplasmic genetic material is contributed only by the female gamete, only the female organism can contribute GM62.
(C) Genetic material is evenly divided between the nucleus and the cytoplasm of a new cell.
Wrong. The passage says male and female gametes contribute equally to nuclear genetic material, not that genetic material is evenly split between nucleus and cytoplasm.
(D) The role of the male gamete in sexual reproduction is less important than the role of the female gamete.
Wrong. The passage describes different contributions, but it does not compare their importance.
(E) It is likely that other types of genetic material that are contributed exclusively by the male gamete will be identified.
Wrong. The passage gives no basis for predicting discovery of male-only genetic material.
Answer: (B)