Animal reproduction
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Animal Reproduction. Sexual & Asexual. By Diana L. Duckworth Rustburg High School Campbell County. Asexual Reproduction. Budding – small part of parent’s body grows into new organism. Genetically identical

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Animal Reproduction

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Animal Reproduction

Sexual & Asexual


Diana L. Duckworth

Rustburg High School

Campbell County

Asexual Reproduction

  • Budding – small part of parent’s body grows into new organism




Asexual Reproduction

  • Regeneration – parent separates into two or more pieces & each piece forms new organism

    • In some instances just a new part grows

    • Sponges, sea stars, jellyfish, planaria

    • Also be clones

Asexual Reproduction

  • Parthenogenesis – growth & development of embryo without fertilization by male

  • Population all female

Many insects; lizards, salamanders, fish, turkeys

Sexual Reproduction – gametes from opposite sexes unite

  • Species with sexual reproduction are said to be dioecous – separate sexes

  • Often exhibit distinct sexual dimorphism – males and females look different

  • Sperm (male gamete) formed by meiosis in testes

  • Eggs (female gamete) formed by meiosis in the ovary


  • Mating – male & female join together to ensure fertilization; not essential to sexual reproduction

External Fertilization

  • Males & females release sperm & eggs into the environment – sperm & egg join outside the body

    • Males & females may come into close proximity

    • Eggs & larvae develop outside the body

    • Many gametes produced; many zygotes formed

    • Usually aquatic

External Fertilization – e.g. Salmon

Internal fertilization

  • Joining of sperm & egg inside the body after mating

    • Ensures selection of mate (not random); promotes diversity

    • Parents protect and care for young

    • Does not require water; can occur on land

    • Less sex cells produced; increases probability of successful reproduction

    • Common in birds, reptiles & mammals

Internal fertilization; external development

  • After fertilization, larvae (embryo) are released & development occurs outside female body

  • Example: Barnacles

Internal fertilization & development

  • Females put large amounts of energy into development of embryo – very few in litter or clutch – different schemes

  • Eggs in “shell” are laid and either abandoned or nurtured in nest

Various levels of parental care

Internal fertilization & internal development of eggs; followed by live birth

Internal fertilization, internal development of embryo to fetus, live birth

In seahorses, eggs are deposited in the male

where they are fertilized and develop. Babies

born live.

In most species, it is the female who carries the developing fetus to birth…


  • Organisms that change sex in order to reproduce

Crepidula fornicata – a snail

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