Question

Mark the mismatch pair.

• A. Mixing of chromosomes of male and female pronuclei -- Karyogamy
• B. Morphogenetic movements so as to form germinal layers -- Gastrulation.
• C. Discharge of semen in vagina during copulation -- Fertilization
• D. A series of rapid mitotic divisions in zygote -- Cleavage

Hint:

Fertilization occurs after sperm meets the egg, whereas the discharge of semen is part of copulation, not fertilization.

Answer 1

The Correct Option is C

Step 1: Understanding the processes.
- Karyogamy is the fusion of male and female pronuclei.
- Gastrulation is the process by which the germinal layers are formed.
- Fertilization is the fusion of sperm and egg, but the discharge of semen in the vagina is part of the copulation process, not the fertilization itself.
- Cleavage refers to the rapid mitotic divisions of the zygote after fertilization.
Step 2: Analyzing the options.
(A) Mixing of chromosomes of male and female pronuclei -- Karyogamy: Correct, this is the definition of karyogamy.
(B) Morphogenetic movements so as to form germinal layers -- Gastrulation: Correct, gastrulation is the process of forming germinal layers.
(C) Discharge of semen in vagina during copulation -- Fertilization: Incorrect, fertilization occurs after sperm reaches the egg, not during semen discharge.
(D) A series of rapid mitotic divisions in zygote -- Cleavage: Correct, cleavage is the process after fertilization.
Step 3: Conclusion.
The correct mismatch pair is (C) Discharge of semen in vagina during copulation -- Fertilization.