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Sexual Reproduction in Animals

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Presentation on theme: "Sexual Reproduction in Animals"— Presentation transcript:

1 Sexual Reproduction in Animals
Male Female Gamete – sperm Gonad – testes Many sperm cells - spermatogenesis Sperm cells are(n) haploid/monoploid Gamete – egg Gonad – ovary Few to many eggs - oogenesis Egg cells are (n) haploid/monoploid

2 Sperm *Smaller *Swims through liquid *Head, middle, & tail (flagellum) Egg *Larger than a body cell *Cannot move on its own *Round shape

3 Fertilization Sperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote.

4 External Fertilization *outside the body
Animals that breed in the water Many hazards in the environment Sperm and egg may not meet Eggs or offspring may be eaten May die due to environmental conditions Temperature Oxygen level

5 Large number of sperm and egg are released to overcome hazards
Hormones control behavior to have sperm and egg released at the same time.

6 Internal Fertilization *within the female body
Land animals Some aquatic animals Shark Octopus

7 Requires specialized sex organ to carry sperm to body of female
Watery environment needed for sperm to swim to the egg

8 After fertilization, zygote is enclosed in a protective shell and released OR remains and develops in female body Zygote Turtle laying eggs

9 Internal Fertilization
Fewer eggs needed Well protected Increased chance of fertilization Parthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps

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