CBSE - XII Science - Biology - Reproduction in Organisms
HOW ARE PARTHENOGENETICALLY DEVELOPED ORGANISMS DIFFERENT FROM ORGANISMS DEVELOPED FROM SIMPLE FERTILIZATION?
Development of an egg (ovum) into a complete individual without fertilisation is called parthenogenesis.
- Parthenogenetic offspring usually have the diploid chromosome number.
- Based on the mechanism involved in restoring the diploid number of chromosomes, parthenogenetic offspring may either have all or half of the mother's alleles.
- The offspring having all of the mother's genetic material are called full clones and those having only half are called half clones.
- Full clones are usually formed without meiosis. If meiosis occurs, the offspring will get only a fraction of the mother's alleles.
- Parthenogenetic offspring in species that use either the XY or the X0 sex-determination system have two X chromosomes and are females.
- In species that use the ZW sex-determination system, they have either two Z chromosomes and are males or two W chromosomes (mostly non-viable, but rarely females), or they could have one Z and one W chromosome (females).
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