Which of the following is TRUE about ASEXUAL reproduction?
Group of answer choices
It does not occur in plants
It results in two 1n offspring from a 2n parent
It is the preferred reproductive mode in unstable environments
Organisms that reproduce asexually cannot also reproduce sexually
It can occur in some vertebrates
The Correct Answer and Explanation is :
The correct statement about asexual reproduction is: “It can occur in some vertebrates.”
Explanation:
Asexual reproduction is a mode of reproduction that does not involve the fusion of gametes, resulting in offspring genetically identical to the parent. While commonly observed in single-celled organisms like bacteria and many plants, asexual reproduction also occurs in certain vertebrate species. One notable form of asexual reproduction in vertebrates is parthenogenesis, where an embryo develops from an unfertilized egg. This phenomenon has been documented in various vertebrates, including some species of fish, amphibians, and reptiles. For instance, certain lizards and snakes are capable of parthenogenetic reproduction, leading to populations composed entirely of females.
Regarding the other statements:
- “It does not occur in plants”: This is incorrect. Asexual reproduction is widespread in plants through mechanisms such as vegetative propagation, where new plants grow from parts of the parent plant like stems, roots, or leaves. Examples include the growth of new plants from runners in strawberries or from tubers in potatoes.
- “It results in two 1n offspring from a 2n parent”: This statement is misleading. In asexual reproduction, offspring are typically produced through mitotic divisions, resulting in offspring that have the same ploidy level as the parent. For example, if the parent is diploid (2n), the offspring will also be diploid. The reduction to haploid (1n) cells is characteristic of meiosis in sexual reproduction, not asexual reproduction.
- “It is the preferred reproductive mode in unstable environments”: This is generally false. Asexual reproduction produces genetically identical offspring, which can be advantageous in stable environments where the parent’s traits are well-suited. However, in unstable or changing environments, genetic diversity from sexual reproduction provides a better chance for some offspring to survive new conditions. Therefore, sexual reproduction is often favored in unstable environments due to the increased genetic variation it offers.
- “Organisms that reproduce asexually cannot also reproduce sexually”: This is incorrect. Many organisms are capable of both asexual and sexual reproduction, switching between the two methods based on environmental conditions. For example, certain species of aphids reproduce asexually during favorable conditions to rapidly increase their population and switch to sexual reproduction when conditions become less favorable, allowing for greater genetic diversity.
In summary, asexual reproduction is a versatile reproductive strategy observed across various life forms, including some vertebrates, and its occurrence and prevalence are influenced by environmental stability and the specific life history strategies of organisms.