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Sexual reproduction презентация
Содержание
- 1. Sexual reproduction
- 2. Sexual reproduction is the production of new
- 3. Sexual reproduction occurs by means of gametes.
- 5. Organs which produce gametes are called Gonads.
- 6. Production of Gametes Production of male or
- 7. FERTILIZATION The union of egg and sperm
- 8. Steps of Sexual Reproduction testis sperms
- 9. POLLINATION
- 10. Trаnsfer of pollen from anther to stigma
- 12. After pollination; A pollen tube grows down
- 13. FERTILIZATION The generative nucleus is divided into
- 15. SEED AND FRUITS After the fertilization, each
Sexual reproduction is the production of new offsprings from two parents. Sexual reproduction is the combination of one set of genetic material from two organisms of the same species, but opposite
Слайд 2Sexual reproduction is the production of new offsprings from two parents.
Sexual
reproduction is the combination of one set of genetic material from two organisms of the same species, but opposite sex, resulting in a new organism with new gene combination.
Слайд 3Sexual reproduction occurs by means of gametes.
They are produced in reproductive
organs by means of meiotic cell division
Gametes have n number of chromosome.
GAMETES
Слайд 5Organs which produce gametes are called Gonads.
Female Gonad is called
ovary that produce egg.
Male gonad is called testes that produce sperm .
Слайд 6Production of Gametes
Production of male or female gametes are called Gametogenesis.
Especially
production of sperm is called Spermatogenesis.
Production of egg is called oogenesis.
Production of egg is called oogenesis.
Слайд 7FERTILIZATION
The union of egg and sperm is called FERTILIZATION.
The cell that
is formed from union of an egg and sperm is called ZYGOTE.
Gametes have n number of chromosome and zygote has 2n number of chromosome.
Gametes have n number of chromosome and zygote has 2n number of chromosome.
Слайд 8Steps of Sexual Reproduction
testis
sperms
ovary
eggs (ova)
zygote
embryo
foetus
baby
fertilization
Meiosis
Meiosis
Слайд 10Trаnsfer of pollen from anther to stigma is called pollination.
Pollination
occurs by means of wind,water, insects and other animals
Слайд 12After pollination;
A pollen tube grows down through the stigma and stylus
into the ovary.
The tube nucleus controls the formation of pollen tube.
Then pollen tube enters the ovule through the microphyle
The tube nucleus and generative nucleus pass from pollen grain to pollen tube.
The tube nucleus controls the formation of pollen tube.
Then pollen tube enters the ovule through the microphyle
The tube nucleus and generative nucleus pass from pollen grain to pollen tube.
Слайд 13FERTILIZATION
The generative nucleus is divided into two sperm nuclei in the
pollen tube.
2 Sperm nuclei enter the embryo sac.
One sperm fertilizes to egg cell to form ZYGOTE.
Other sperm fuses with pollar nüclei to form triploid (3n) ENDOSPERM.
This type of fertilization is called Double Fertilization.
2 Sperm nuclei enter the embryo sac.
One sperm fertilizes to egg cell to form ZYGOTE.
Other sperm fuses with pollar nüclei to form triploid (3n) ENDOSPERM.
This type of fertilization is called Double Fertilization.
Слайд 15SEED AND FRUITS
After the fertilization, each ovule develops to seed.
The ovary
develops to fruit.
