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Formation of Twins
Formation of Twins
15.5
Formation of Twins
Types of twins
Identical twins
Fertilisation
1 ovum fertilised by 1 sperm
Zygote formation
Formed from 1 zygote
Placenta
Share one placenta but have their own umbilical cord
Embryo division
Divide into two
Umbilical cords
2
Gender
Same sex
Genetic constitution
Identical
Physical characteristics
Identical
Fingerprints
Unique (different)
Types of twins
Siamese twins
Fertilisation
1 ovum fertilised by 1 sperm
Zygote formation
Formed from 1 zygote
Placenta
Share one placenta but have their own umbilical cors
Embryo division
Incomplete division
Umbilical cords
2
Gender
Same sex
Genetic constitution
Identical
Physical characteristics
Identical
Fingerprints
Unique (different)
Types of twins
Fraternal twins
Fertilisation
2 ovum fertilised by 2 sperm
Zygote formation
Formed from 2 different zygote
Placenta
Each has their own placenta and umbilical cords
Embryo division
Not divide into two
Umbilical cords
2
Gender
Same/different sex
Genetic constitution
Different
Physical characteristics
Different
Fingerprints
Unique (different)
Formation of Twins
15.5
Formation of Twins
Types of twins
Identical twins
Fertilisation
1 ovum fertilised by 1 sperm
Zygote formation
Formed from 1 zygote
Placenta
Share one placenta but have their own umbilical cord
Embryo division
Divide into two
Umbilical cords
2
Gender
Same sex
Genetic constitution
Identical
Physical characteristics
Identical
Fingerprints
Unique (different)
Types of twins
Siamese twins
Fertilisation
1 ovum fertilised by 1 sperm
Zygote formation
Formed from 1 zygote
Placenta
Share one placenta but have their own umbilical cors
Embryo division
Incomplete division
Umbilical cords
2
Gender
Same sex
Genetic constitution
Identical
Physical characteristics
Identical
Fingerprints
Unique (different)
Types of twins
Fraternal twins
Fertilisation
2 ovum fertilised by 2 sperm
Zygote formation
Formed from 2 different zygote
Placenta
Each has their own placenta and umbilical cords
Embryo division
Not divide into two
Umbilical cords
2
Gender
Same/different sex
Genetic constitution
Different
Physical characteristics
Different
Fingerprints
Unique (different)
Chapter : Sexual Reproduction, Development and Growth
Topic : Formation of Twins
Form 4
Biology
View all notes for Biology Form 4
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Communication in Biology
Scientific Investigation in Biology
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