Vedeo sex with cart credit
If the child inherits an X and a Y sex chromosome (XY), he will be a male.The mother's egg will always provide the child with an X sex chromosome because the mother has no Y chromosome to pass down.As a member, you'll also get unlimited access to over 70,000 lessons in math, English, science, history, and more.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.The sex of a child is always determined by which sex chromosome is carried by the sperm that fertilizes the egg.
Identical twins, or monozygotic twins, develop if one of the mother's eggs is fertilized and then splits into two genetically identical parts before the embryo starts to develop. Fraternal twins develop when two separate eggs are fertilized by different sperm and implant in the uterus at the same time. We have over 95 college courses that prepare you to earn credit by exam that is accepted by over 2,000 colleges and universities.
Now let's look at what could cause Tracey to become pregnant with twins.
There are two types of twins that Tracey could conceive: identical and fraternal.
This type of twin develops when two separate eggs are fertilized by different sperm and implant in the uterus at the same time.
These twins will have the same genetic connection as any other siblings and will share 50% of the same DNA.