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What is parthenogenesis?
What is parthenogenesis?
Parthenogenesis is a natural form of asexual reproduction in which growth and development of embryos occur in a gamete (egg or sperm) without combining with another gamete.
Give an example of an animal in which parthenogenesis occurs.
Give an example of an animal in which parthenogenesis occurs.
Some invertebrate animal species, such as nematodes, some tardigrades, water fleas, some scorpions, aphids, some mites, some bees, some Phasmatodea, and parasitic wasps, exhibit parthenogenesis.
In which organisms is parthenogenesis a component process of apomixis?
In which organisms is parthenogenesis a component process of apomixis?
In plants, parthenogenesis is a component process of apomixis.
What is the chromosome number of normal egg cells formed in the process of meiosis?
What is the chromosome number of normal egg cells formed in the process of meiosis?
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What can parthenogenetic offspring usually have in terms of the mother's alleles?
What can parthenogenetic offspring usually have in terms of the mother's alleles?
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Study Notes
Parthenogenesis
- A form of asexual reproduction where an egg develops into an embryo without fertilization
- Occurs in various animal species, including some insects, fish, amphibians, reptiles, and birds
- Common in invertebrates, especially in insects like aphids and some ants, wasps, and bees
Example
- Komodo dragon is a well-known example of an animal capable of parthenogenesis
Parthenogenesis and Apomixis
- In plants, apomixis is a form of asexual reproduction where seeds are produced without fertilization
- Parthenogenesis can be a component process where an egg develops into an embryo without fertilization
- Apomixis occurs in some species of plants, like dandelions
Chromosome Number in Meiosis
- In normal meiosis, a diploid cell divides into four haploid gametes, each with half the number of chromosomes as the parent cell
- The chromosome number of normal egg cells is haploid, which is half the number of chromosomes in the parent cell
Parthenogenetic Offspring
- Parthenogenetically developed offspring, typically inherit a copy of each chromosome from the mother
- They are usually genetically identical to the mother, except for potential mutations
- This means they can have a full set of the mother's alleles
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Description
Test your knowledge of parthenogenesis with this quiz! Explore the concept of asexual reproduction and learn about the development of embryos in both animals and plants.
