b2

why does sexual reproduction cause variation in the offspring

• there is a mixing of genetic info

  • gametes are not geneticallt identical

what are advantages of embryo screening

can find out if the embryo has the disorder

can prepare for the baby

DISADV of embryo screening

expensive

ethical concerns

what is IVF?

the process of collecting eggs from the womens ovaries and fertilising them in a lab using the mans sperm

describe the process of IVF

1. The sperm is injected directyl into the egg

2. the fertilised egg are then grown into embryos in a lab incubator

   1. once the embryos are tiny balls of cells, one or two of them are transferred to the womens ovaries to improve the chance of pregnancy

Why are FSH and LH given before IVF

To stimulate sevral eggs to mature

CONS of IVF

Multiple briths can happen if more than one embryo is grown into the baby

why are microscopes needed in IVF

TO SEE if the egg has been fertilised

what is a internal condition controlled by homeostasis

water

what is embryo screeing

when embryos are screened for genetic info z