slide-deck.pptx gamete fertilisationpptp

Gamete

1. Gametes and fertilisation in sexual reproduction Reproduction in humans

2. gametes fertilisation egg cell sperm cell embryo

3. Gametes are the sex cells in humans, which are egg and sperm cells. A sperm cell is the male gamete. The zygote divides to form a ball of cells called the embryo . An egg cell is the female gamete. Fertilisation occurs when an egg cell and a sperm cell fuse to form a zygote.

4. Sexual reproduction Chromosome number Embryo development Gametes and fertilisation in sexual reproduction

5. female human male human zygote reproduction baby growth Sexual reproduction Humans reproduce using sexual reproduction. DNA passed from both parents The zygote is a fertilised egg cell. It is the offspring of both parents.

6. Gametes is the scientific term for sex cells. Sexual reproduction Human females produce egg cells . Human males produce sperm cells . egg cell sperm cell The DNA from each parent is carried by sex cells.

7. Each gamete carries half of the genetic information required to make an offspring. Sexual reproduction egg cell sperm cell nucleus chromosome DNA This genetic information is coded in DNA, which is packaged into chromosomes stored in the nucleus of each gamete.

8. Sexual reproduction sperm cell egg cell gametes chromosome zygote the sex cells the male gamete the female gamete packaged DNA, stored in nucleus the fertilised egg cell

9. Sexual reproduction Tick one box for each statement. The gametes are the sex cells. Sperm and egg cells are needed for human reproduction. A sperm cell carries all the genetic information of the parents. A zygote carries half of the genetic information. a b c d I am sure this is correct I think this is correct I think this is incorrect I am sure this is incorrect

10. Sexual reproduction Tick one box for each statement. Sperm and egg cells are needed for human reproduction. A sperm cell carries all the genetic information of the parents. A zygote carries half of the genetic information. a b c d I am sure this is correct I think this is correct I think this is incorrect I am sure this is incorrect The gametes are the sex cells.

11. Sexual reproduction Chromosome number Embryo development Gametes and fertilisation in sexual reproduction

12. Human sperm and egg cells meet in the fallopian tubes. Chromosome number The sperm cell enters the egg cell. fallopian tubes

13. Chromosome number The nucleus of the sperm cell fuses with the nucleus of the egg cell during fertilisation . The fertilised egg cell is now called a zygote. The zygote is the offspring of the human parents and will have 46 chromosomes. gametes 23 chromosomes each nuclei fuse zygote 46 chromosomes sperm cell enters the egg

14. The sperm cell and the egg cell fuse in the uterus to form a zygote where development continues. Chromosome number Fertilisation occurs in the uterus of the female reproductive system. The sperm cell and the egg cell fuse in the fallopian tubes to form a zygote which then moves to the uterus.

15. Chromosome number There are two copies of each chromosome in the nucleus of the zygote, one copy from each parent’s gamete. Humans have 23 pairs of chromosomes. nucleus one pair of chromosomes four pairs of chromosomes

16. Different organisms have different numbers of chromosomes. Chromosome number Offspring always have the same number of chromosomes as their parents. adult horse 64 chromosomes foal 64 chromosomes horse gametes 32 chromosomes each The gametes of organisms always have half the number of chromosomes.

17. Match the organism to the number of chromosomes in its gametes. Chromosome number spotted seal 32 chromosomes in body cells clownfish 24 chromosomes in body cells corn 20 chromosomes in body cells sparrow 76 chromosomes in body cells number of chromosomes in gametes 10 16 38 12

18. Chromosome number Andeep and Alex are discussing the chromosome numbers in humans and their offspring. Adults and babies have 46 chromosomes. Zygotes have 23 as they have not yet grown into a baby. Adults, babies and zygotes have 46 chromosomes, and gametes have 23 each. Andeep Alex Choose the pupil with the correct understanding. Write a description of the changing chromosome number from gamete to baby. Use labelled diagrams.

19. Choose the pupil with the correct understanding. Write a description of the changing chromosome number from gamete to baby. Use labelled diagrams. Chromosome number Adult humans 46 chromosomes Gametes each have half the genetic material of the adult. 23 chromosomes The nuclei of the gametes fuse to form the zygote. 46 chromosomes The zygote grows to become a baby. 46 chromosomes Alex

20. Sexual reproduction Chromosome number Embryo development Gametes and fertilisation in sexual reproduction

21. A zygote is the offspring of the two human parents. Embryo development The gametes have 23 chromosomes each. When the nuclei fuse, the zygote has 46. The zygote is the start of a new life cycle. It has a full set of chromosomes.

22. The life cycle continues as the zygote makes more cells and grows to form an embryo . Embryo development This starts in the fallopian tube and continues as it moves into the uterus. microscope image of an embryo

23. The zygote continues to make new cells, these cells start to take on specific jobs until a foetus is developed. Embryo development The foetus becomes a baby at birth. foetus

24. foetus Embryo development Starting with the earliest, put these stages of embryo development in the correct order. zygote baby embryo a b c d zygote foetus baby embryo

25. Draw a correct life cycle of a human including the stages of embryo development. Label reproduction and growth on the arrows. Embryo development Lucas has drawn a life cycle of humans including some detail of embryo development. adolescent gametes adult child foetus Lucas has missed some stages, and the arrows are not labelled.

26. Embryo development Draw a correct life cycle of a human including the stages of embryo development. Lucas has drawn a life cycle of humans including some detail of embryo development. adolescent zygote adult child foetus embryo baby

27. Embryo development 2. Label reproduction and growth on the arrows. adolescent zygote adult child foetus embryo baby reproduction growth

28. Humans reproduce through sexual reproduction which involves each gamete passing half of the parents’ genetic information to the offspring. The DNA from the parents is packaged in chromosomes. Each human gamete contains 23 chromosomes. Fertilisation occurs when gametes join to form a zygote. The zygote is the first stage in the growth of the offspring, and it has a full set of chromosomes (46 in humans). The zygote divides to form a ball of cells called an embryo , which then grows to form a foetus and then a baby. Gametes and fertilisation in sexual reproduction Sperm cells and egg cells are the sex cells of humans. These are called gametes .