Science questions please help!!!!!!!!!!!!!!!!!!?

Describe 4 methods used to manipulate reproduction in plants?





What r 2 reasons zoos use artificial insemination?





What is in vitro fertilization?





When is it used to slove infertility promblems in humans?





What does GIFT stand 4?





Y r some people at risk of passing on genetic dieases to thier offspring?





2 resons why embroyos are sometimes frozen and stored for later use

Science questions please help!!!!!!!!!!!!!!!!!!?
I will give you a couple but you need to look up the rest.





2 reasons zoos use artificial insemination. 1) usually a zoo will have very closely related animals in a collection, often parent and offspring or siblings. To reduce inbreeding they will get semen from outside sources to impregnate resident females. 2) usually a zoo environment is not conducive for romance between an animal pair. This problem is circumvented by using artificial insemination so the female can become pregnant without having to go through the courting rituals.





Artificial or in vitro fertilization is used for humans for two major reasons. 1) low sperm count on the part of the males can be compensated for by specifically introducing donated sperm to the egg. 2) Damaged or obstructed fallopian tubes can be circumvented using in vitro fertilization where the egg and sperm are joined in a petri dish and the fertilized egg is returned to the uterus.





Finally risk of passing a genetic disease to offspring is a matter of simple math. For the donor that carries a dominant trait for a given disease, there will be a certainty of passing on the condition. For the donor that carries a recessive trait for a disease there are the odds of joining with a mate that also carries the recessive gene for the trait. Then there are the odds of both parents passing that recessive gene to the offspring.


Now the rest are up to you, unless someone out there lets you off easy and answers the rest.
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