Tipos de estímulos animales
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Transcript of Tipos de estímulos animales
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TIPOS DE ESTÍMULOS DETECTADOS POR LOS ANIMALES
temperatura
presión
luz
sonido
Otros organismos
Físicos Bióticos
sales
pollutants
agua
Quimicos
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REPRODUCTION IN ANIMALS
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• Asexual reproduction involves only one parent that produces two or more genetically similar organisms. It occurs mainly in organisms with a simple structure.
• Sexual reproduction involves two parents. A male sex cell joins with a female sex cell (fertilization) and they form a new cell called a zygote. The zygote grows into a new organism.
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Budding
Fragmentation
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SEXUAL REPRODUCTION
• Two parents of different sex are involved.• The offspring are different from their
parents and from each other
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Gonads produce sexual cells.• The gonads in males are the testicles.• The gonads in females are the ovaries.
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Sexual cells or gametes.• Ova or eggs, from the ovaries• Sperm cells, from the testes.
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MALE FEMALE
GONADS Testicles Ovaries
GAMETES Spermatozoid ovule
GAMETES SIZE Small big
GAMETES SHAPE flagelle
MOBILE GAMETES? Yes no
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TYPES OF FERTILIZATIONInternal fertilization •It occurs in terrestrial animals.•The male introduce sperm cells in the female’s body (copulation). •Sperm cells and ova join inside the mother
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External fertilization • Occurs in some animals living in water. • The female releases a large amount of ova.• The male releases the sperm cells. • Sperm cells join ova by chance.
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EMBRYONIC DEVELOPMENT
Oviparity. Oviparous lay eggs.
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EMBRYONIC DEVELOPMENT
Vivipary. The embryo develops inside the body of the mother.
Ovoviviparity. The embryo develops within eggs that remain within the mother's body up until they hatch.