Which of the following characterizes parthenogenesis? a. An individual may change its sex during its lifetime. b. Specialized groups of cells grow into new individuals. c. An organism is first a male and then a female. d. An egg develops without being fertilized.

Verified step by step guidance

1. Step 1: Understand the term 'parthenogenesis'. Parthenogenesis is a type of asexual reproduction in which an egg develops into a new individual without being fertilized.
2. Step 2: Look at each option and determine if it describes parthenogenesis. Option a describes sequential hermaphroditism, not parthenogenesis. Option b describes budding or regeneration, not parthenogenesis. Option c also describes sequential hermaphroditism.
3. Step 3: Option d states 'An egg develops without being fertilized.' This is the definition of parthenogenesis.
4. Step 4: Therefore, the correct answer is option d.

Key Concepts

Parthenogenesis

Parthenogenesis is a form of asexual reproduction where an egg develops into an organism without fertilization by a sperm. This process is observed in various species, including some reptiles, amphibians, and insects, allowing them to reproduce in environments where mates are scarce.

Asexual Reproduction

Asexual reproduction is a mode of reproduction that does not involve the fusion of gametes. It allows organisms to produce offspring that are genetically identical to the parent, which can be advantageous in stable environments where adaptation to new conditions is less critical.

Sexual Dimorphism

Sexual dimorphism refers to the differences in appearance or behavior between males and females of the same species. In the context of parthenogenesis, it is important to note that some organisms may exhibit sexual dimorphism, but parthenogenetic reproduction typically does not involve the traditional male-female reproductive roles.