"There are two basic types of twins: monozygotic (also known as "identical") and dizygotic (also known as "fraternal").
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"There's no doubt that identical twins stand out more and are more easily recognized. However, they are not the most prevalent type of twins. In fact, you might be surprised to find that two thirds of all twins are dizygotic. Dizygotic twins occur when two sperm fertilize two distinct eggs. In this instance, rather than releasing one egg during ovulation, the mother has released two. (For higher multiple births, more eggs are released - for example, in trizygotic triplets, three eggs are fertilized by three sperm.)
Dizygotic (DZ), or fraternal twins, can be one of three combinations:
Two males (represents about one-fourth of all DZ twin sets)
Two females (represents about one-fourth of all DZ twin sets)
One male and one female (represents one-half of all DZ twin sets)
The fertilization of two eggs by two sperm results in two separate embryos — each with its own chorion (outer membrane of the amniotic sac), amnion (inner membrane of the amniotic sac) and placenta. In some instances, if the embryos implant very nearby each other along the uterine wall, the placentas can become fused.
Because they are formed from two distinct eggs and two distinct sperm, DZ twins are genetically no more similar than regular siblings are, sharing 50 percent of their DNA."
From:
How Twins Work - Baby Making 101
Show me the evidence where a human being does not begin at conception, otherwise your opinion is based on emotional
bias.
Perhaps you need to do some more
study, since you didn't get the basic understanding of embryology in school like you claim. The site quoted below has a ton of books. That would be a good place to start.
"Some people argue that science does not say that life begins at conception. For example, NARAL has asserted that “Personhood at conception is a religious belief, not a provable biological fact.”1
However, this is simply not sure. Scientific sources, including textbooks and medial experts, are essentially unanimous in saying that human life begins at conception and fertilization."
From:
25 Scientific Sources: Life Begins at Conception