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  4. Describe the development of a zygote into an embryo and subsequently into a foetus during pregnancy until birth

Fertilisation and Pregnancy

4.4  Fertilisation and Pregnancy

 

 The process of fertilisation and embryo implantation
  1. Sperms will swim into the vagina during copulation.
  2. If an ovum is present in the Fallopian tube, fertilisation may occur. Sperm will fuse with ovum in the Fallopian tube and form zygote.
  3. Ater ferttilisation, the zygote will divide itself and become a ball of cells known as embryo. The embryo will be implanted on the uterine wall at the uterus.

 

 The growth of zygote to embryo and foetus until birth

Week 1 - 4

  • Hands and feet will start to form.
  • The embryo has a tiny tail.

Week 7 -9 

  • Nose, ears and fingers will be visible

Week 10 - 19

  • Embryo will look like a baby
  • The embryo is now known as a foetus

Week 20 - 37

  • Foetus will resemble a baby

Week 38 - 40

  • Foetus is fomed completely
  • The foetus turns until the head is engaged at the cervix
  • The muscle of the uterine lining will contract strongly, the amnion will burst and amniotic fluid will be released
  • Foetus is pushed out of the uterus through the vagina and then out of the body.

 
The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of pandai.

Fertilisation and Pregnancy

4.4  Fertilisation and Pregnancy

 

 The process of fertilisation and embryo implantation
  1. Sperms will swim into the vagina during copulation.
  2. If an ovum is present in the Fallopian tube, fertilisation may occur. Sperm will fuse with ovum in the Fallopian tube and form zygote.
  3. Ater ferttilisation, the zygote will divide itself and become a ball of cells known as embryo. The embryo will be implanted on the uterine wall at the uterus.

 

 The growth of zygote to embryo and foetus until birth

Week 1 - 4

  • Hands and feet will start to form.
  • The embryo has a tiny tail.

Week 7 -9 

  • Nose, ears and fingers will be visible

Week 10 - 19

  • Embryo will look like a baby
  • The embryo is now known as a foetus

Week 20 - 37

  • Foetus will resemble a baby

Week 38 - 40

  • Foetus is fomed completely
  • The foetus turns until the head is engaged at the cervix
  • The muscle of the uterine lining will contract strongly, the amnion will burst and amniotic fluid will be released
  • Foetus is pushed out of the uterus through the vagina and then out of the body.

 
The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of pandai.
Chapter : Reproduction
Topic : Describe the development of a zygote into an embryo and subsequently into a foetus during pregnancy until birth
Form 1 Science
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