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Which of the following statements is true regarding the gametes in sexual reproduction?
Both gametes are always diploid
The male gamete is typically smaller and motile
The female gamete is always flagellated
Gametes are formed by mitosis
The male gamete is typically smaller and motile
In sexual reproduction, anisogamy is the form of sexual reproduction where the two gametes differ in size. The male gamete (sperm/antherozoid) is typically smaller and motile, while the female gamete (ovum/egg) is larger and non-motile.
In sexual reproduction, anisogamy is the form of sexual reproduction where the two gametes differ in size. The male gamete (sperm/antherozoid) is typically smaller and motile, while the female gamete (ovum/egg) is larger and non-motile.
Think of the female gamete as a stationary, well-stocked 'home base' and the male gamete as a small, swift 'scout' sent out to find it.
MSM: Male, Small, Motile.
2nтЖТn тАФ Representation of Meiosis, where a diploid cell (2n) divides to form haploid (n) gametes.
The principle relies on biological specialization: the male gamete invests in motility mechanisms (like flagella) to actively seek the female, while the female gamete invests in stored nutrients and cytoplasm to support the developing zygote. This division of labor enhances the probability of successful fertilization.
Gametes are haploid cells produced by meiosis.
Isogamy refers to fusion of morphologically similar gametes, whereas anisogamy refers to dissimilar ones.
Oogamy is a specialized type of anisogamy where the female gamete is large and non-motile.
Increases genetic diversity through recombination.
Allows for specialized roles for efficient fertilization.
Requires more energy and time compared to asexual reproduction.
Requires the presence of two compatible individuals.
Sexual reproduction in most animals.
Sexual reproduction in many complex plants and algae.
| Feature | Male Gamete | Female Gamete |
|---|---|---|
Gamete Trait | Small and Motile | Large and Non-motile |
A) Incorrect: Gametes are always haploid (n) to restore the diploid (2n) state upon fertilization.
C) Incorrect: Female gametes are generally non-motile to facilitate nutrient storage.
D) Incorrect: Gametes are produced via meiosis, a reductional division process.
B is correct тАФ The male gamete is typically smaller and motile, reflecting the strategy of active searching in anisogamous sexual reproduction.
Always remember that sexual reproduction aims for genetic variation; therefore, look for traits that increase the efficiency of fertilization (motility) or survival of the zygote (large food reserve).