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Zoology

Chapter 3: Animal Reproduction

TermDefinition
Asexual Reproduction reproduction without meiosis occurring
3 types of asexual reproduction Budding, Fission, fragmentation
budding an outgrowth or ingrowth of the body wall to form a new individual.
Fission separation into two equal parts to form a new individual.
Fragmentation Fragmentation followed by regeneration
Sexual Reproduction Formation of gametes by meiosis followed by fertilization to form a zygote.
Zygote a fertilized egg cell
Parthenogenesis (False + origin} Development of an egg without fertilization; the diploid egg is produced by mitosis and hatches and develops into a female.
Examples of parthenogenesis some invertebrates and some reptiles
Gametogenesis (Gamete + origin) The formation of spermatozoa. Meiosis and Mitosis occur to form four functional spermatozoa from a spermatogonium cell.
Oogenesis (Ovum + origin) the formation of the ovum or egg. Meiosis and mitosis occur to form only one functional ovum from an oogonium cell.
Fertilization The union or fusion of the egg cell and sperm cell to form a zygote; the process restores the diploid number of chromosomes.
Modes of fertilization External and Internal Fertilization
External Fertilization the eggs and sperm are fertilized outside the body
Examples of external fertilization most invertebrates, fishes, and some amphibians
Internal Fertilization the eggs and sperm are fertilized inside the body
Examples of internal fertilization most vertebrates
Created by: SilverLady
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