Which type of reproduction involves the fusion of gametes from two parents?

Step 1: Analyze the question The question asks which type of reproduction involves fusion of gametes from two parents. The key words are "gametes," "fusion," and "two parents."

Step 2: Explain the concept

• Gametes are sex cells: sperm (male) and egg/ovum (female) in animals, or pollen and ovule in plants.
• Fertilization is the fusion of a male gamete with a female gamete to form a zygote.
• Because two parents each contribute a gamete, the offspring has a mix of genetic material from both. This is why children resemble both parents but are not identical to either.

Step 3: Check each option

• A. Sexual reproduction: Involves gametes from two parents fusing to form a zygote. This matches the question.
• B. Asexual reproduction: Needs only one parent and no gametes. The offspring are genetically identical to the parent.
• C. Binary fission: A form of asexual reproduction in which one cell splits into two (e.g., amoeba, bacteria). It involves one parent and no gametes.
• D. Budding: Also asexual. A new individual grows out of the parent's body (e.g., yeast, hydra). It involves one parent and no gametes.

Step 4: Answer The correct answer is A. Sexual reproduction.

Tip: Link the words to the process. "Gametes + fusion + two parents" always means sexual reproduction. "One parent" or "identical offspring" points to asexual reproduction, and binary fission, budding, fragmentation, and spore formation are all asexual types. In an exam, check the number of parents first, and you can often eliminate half the options immediately.