BIOLOGICAL BASES OF BEHAVIOR
BEHAVIOR GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They develop from a single fertilized egg that splits into two
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They develop from two separate fertilized eggs
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They develop from a single fertilized egg that does not split
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They develop from two fertilized eggs that merge into one
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Detailed explanation-1: -Identical twins (also called monozygotic twins) result from the fertilization of a single egg by a single sperm, with the fertilized egg then splitting into two. Identical twins share the same genomes and are always of the same sex.
Detailed explanation-2: -Identical twins possess identical genes, eye and hair colour, and they are always the same sex and have the same blood type as well.
Detailed explanation-3: -To form identical or monozygotic twins, one fertilised egg (ovum) splits and develops into two babies with exactly the same genetic information. To form fraternal or dizygotic twins, two eggs (ova) are fertilised by two sperm and produce two genetically unique children.
Detailed explanation-4: -Sometimes a woman’s ovaries release 2 eggs, and a separate sperm fertilises each egg. This forms twins. These twins are called fraternal twins, dizygotic twins (meaning two zygotes) or non-identical twins.
Detailed explanation-5: -Box 2.1 Monozygotic and Dizygotic Twins Monozygotic or identical twins occur when a fertilized egg splits apart in the first two weeks of development. The result is the creation of two separate, but genetically identical offspring. That is, they possess the same genotype and often the same phenotype.