Presentation on theme: "Sexual Reproduction in Animals"— Presentation transcript:
1Sexual 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
2Sperm*Smaller*Swims through liquid*Head, middle, & tail (flagellum)Egg*Larger than a body cell*Cannot move on its own*Round shape
3FertilizationSperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote.
4External 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
5Large number of sperm and egg are released to overcome hazards Hormones control behavior to have sperm and egg released at the same time.
6Internal Fertilization *within the female body Land animalsSome aquatic animalsSharkOctopus
7Requires specialized sex organ to carry sperm to body of female Watery environment needed for sperm to swim to the egg
8After fertilization, zygote is enclosed in a protective shell and released OR remains and develops in female bodyZygoteTurtle laying eggs
9Internal Fertilization Fewer eggs neededWell protectedIncreased chance of fertilizationParthenogenesis – development of unfertilized egg into an adult.- Bees & Wasps
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