REPRODUCTION
EMBRYONIC DEVELOPMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a fertilized egg dividing into two blastocysts
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two eggs being released at the same time, and both are fertilized
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two embryos implanted in the uterus through invitro fertilization
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all of these can result in twins
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Detailed explanation-1: -All pregnancies start when a sperm fertilises an egg. This fertilised egg is called a zygote. Sometimes a woman’s ovaries release 2 eggs, and a separate sperm fertilises each egg. This forms twins.
Detailed explanation-2: -Identical (monozygotic) twins happen when a single egg (zygote) is fertilised. The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you’ll have 2 girls or 2 boys.
Detailed explanation-3: -Factors that increase the chance of twins include: consuming high amounts of dairy foods, being over the age of 30, and conceiving while breastfeeding. Many fertility drugs including Clomid, Gonal-F, and Follistim also increase the odds of a twin pregnancy.