Fertilisation and pregnancy
- Created by: hannahadams
- Created on: 25-05-15 21:25
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- Fertilisation and pregnancy
- Fertilisation is the fusion of the nuclei of the male and female gametes.
- each gamete is a haploid cell
- fertilisation is important in restoring the diploid number and combining different sets of chromosomes
- a fertilised ovum is known as a zygote and fertilisation takes place in the oviducts
- Process of fertilisation
- 3. one sperm passes through the outer membrane. a barrier forms to prevent entry of more than one sperm
- 2. remaining follicle cells are scattered by sperm
- 5. sperm nucleus and ovum nucleus fuse at fertilisation. a zygote has been formed
- 1. sperm swim towards ovum
- 4. head of sperm crosses ovum cell membrane
- Implantation
- the diploid zygote divides many times by mitosis to form a ball of cells as it travels down the oviduct to the uterus where it becomes embedded in the ticketed lining of the uterus, in a process known as implantation
- once the embryo is attached to the lining of the uterus, some of its outer cells combine with some of the mother's cells and a placenta begins to form
- the embryo then differentiates to produce a variety of tissues and organs
- once the embryo is attached to the lining of the uterus, some of its outer cells combine with some of the mother's cells and a placenta begins to form
- the diploid zygote divides many times by mitosis to form a ball of cells as it travels down the oviduct to the uterus where it becomes embedded in the ticketed lining of the uterus, in a process known as implantation
- Process of implantation
- 2. cilia and peristaltic waves sweep the ovum along the oviduct
- 4. the zygote divides to form a ball of cells
- 1. ovum is released from the ovary at ovulation
- 3. fertilisation usually occurs in the first third to first half of the oviduct
- sperm swim through the uterus towards the ovum in the oviduct
- Sperm are released close to the cervix during sexual intercourse
- 5. the ball of cells becomes an embryo. it implants in the uterus lining and a placenta develops
- Fertilisation is the fusion of the nuclei of the male and female gametes.
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