Presentation on theme: "Sexual Reproduction in Animals"— Presentation transcript:
1 Sexual Reproduction in Animals MaleFemaleGamete – spermGonad – testesMany sperm cells- spermatogenesisSperm cells are(n) haploid/monoploidGamete – eggGonad – ovaryFew to many eggs- oogenesisEgg 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 FertilizationSperm 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 waterMany hazards in the environmentSperm and egg may not meetEggs or offspring may be eatenMay die due to environmental conditionsTemperatureOxygen 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 animalsSome aquatic animalsSharkOctopus
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 bodyZygoteTurtle laying eggs
9 Internal Fertilization Fewer eggs neededWell protectedIncreased chance of fertilizationParthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps
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