how twins are developed Flashcards
What are the two main types of twins?
The two main types of twins are fraternal (dizygotic) twins and identical (monozygotic) twins. They differ in how they develop and their genetic makeup.
occur when two separate eggs are fertilized by two sperm cells. They are genetically similar to regular siblings and may or may not be the same gender.
fraternal (dizygotic)
What are key factors that increase the likelihood of having fraternal twins?
Genetics, Age, Fertility treatments and Other factors
A family history of fraternal twins can increase the chances.
Genetics
Women over 30, particularly in their late 30s or early 40s, have a higher chance.
Age
Medications like Clomid or IVF can increase the likelihood.
Fertility treatments
result from a single fertilized egg that splits into two embryos. They share nearly 100% of their genetic material and develop randomly.
identical (monozygotic) twins
What affects the development of identical twins?
Randomness and Timing of the split
Separate placentas and amniotic sacs.
Early split (within 3 days)
Shared placenta, separate amniotic sacs.
Late split (6-12 days)
Possible conjoined (Siamese) twins.
Very late split (after 13 days)
What factors influence the chances of twin births?
Genetics, Age, Race, Diet and Weight and height
Family history of fraternal twins increases the chances.
Genetics
Women over 30 have a higher likelihood of fraternal twins.
Age
Women of African descent are more likely, while Asian descent women are less likely.
Race
Certain studies suggest that dairy and yams may increase twin chances.
diet
Taller women or those with a higher BMI are more likely to conceive twins.
Weight and height
How do fertility treatments influence the chances of having twins?
Ovulation-stimulating medications (Clomid), In vitro fertilization (IVF) and Assisted reproductive technologies (ART)
Increase the chances of multiple eggs being released.
Ovulation-stimulating medications (Clomid)
Multiple embryos can be implanted, increasing the likelihood of twin pregnancies.
In vitro fertilization (IVF)
Methods like egg retrieval and embryo freezing can also raise the chances of twins
Assisted reproductive technologies (ART)
How are twins conceived during human reproduction?
During intercourse, millions of sperm are released. They travel to the egg, where one sperm penetrates the egg. The zygote divides and implants in the uterus, continuing to develop into an embryo and later a fetus.
How do twins develop in the uterus?
If two separate eggs are fertilized by two sperm or a single egg splits, both embryos develop simultaneously in the uterus, resulting in two babies being carried at the same time.
arise from the fertilization of two eggs.
Fraternal twins
come from a single egg that splits.
Identical twins
