Which of these sequences correctly represents the process of sexual reproduction?

Options

A. Ovum + sperm `to` zygote `to` embryo
B. Zygote + ovum `to` sperm `to` embryo
C. Embryo + ovum `to` zygote `to` sperm
D. Sperm + ovum `to` embryo `to` zygote

Answer

To determine the correct sequence that represents the process of sexual reproduction, we need to follow the steps involved in this biological process. Here’s a step-by-step breakdown:

1. **Gamete Formation**: The process begins with the formation of gametes. In sexual reproduction, the male gamete is called sperm, and the female gamete is called ovum (or egg).

**Hint**: Remember that gametes are the reproductive cells involved in fertilization.

2. **Fertilization**: The next step is fertilization, where the sperm and ovum unite. This process leads to the formation of a zygote.

**Hint**: Think of fertilization as the moment when the male and female gametes come together.

3. **Zygote Formation**: After fertilization, a single-celled zygote is formed. This zygote contains genetic material from both parents.

**Hint**: A zygote is the very first cell of a new organism.

4. **Cell Division**: The zygote undergoes a series of cell divisions (mitosis) to develop further.

**Hint**: This step is crucial as it leads to the development of more cells from the zygote.

5. **Embryo Development**: As the cell divisions continue, the zygote develops into an embryo. This stage involves the differentiation of cells into various tissues and organs.

**Hint**: An embryo is a developing organism in its early stages.

6. **Fetus Development**: Once the embryo is well-developed, it is referred to as a fetus. This stage marks the transition to a more recognizable form of the organism.

**Hint**: The fetus stage is where the organism starts to resemble its species.

After analyzing the steps, the correct sequence of sexual reproduction is:
1. Formation of sperm and ovum (gametes)
2. Fertilization (sperm + ovum = zygote)
3. Zygote formation
4. Cell division (development of embryo)
5. Embryo development
6. Fetus development

Thus, the correct answer to the question is the first option provided, which accurately represents the process of sexual reproduction.