Presentation on theme: "Sexual Reproduction in Animals MaleFemale Gamete – sperm Gonad – testes Many sperm cells - spermatogenesis Sperm cells are(n) haploid/monoploid Gamete."— Presentation transcript:
Sexual Reproduction in Animals MaleFemale 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
Sperm *Smaller *Swims through liquid *Head, middle, & tail (flagellum) Egg *Larger than a body cell *Cannot move on its own *Round shape
Fertilization Sperm nucleus enters the egg and moves to the egg nucleus. The 2 nuclei join together and then form a zygote.
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
Large number of sperm and egg are released to overcome hazards Hormones control behavior to have sperm and egg released at the same time.
Internal Fertilization *within the female body Land animals Some aquatic animals – Shark – Octopus
Requires specialized sex organ to carry sperm to body of female Watery environment needed for sperm to swim to the egg
After fertilization, zygote is enclosed in a protective shell and released OR remains and develops in female body Zygote Turtle laying eggs
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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