When describing a recent medical procedure, katrina says, "the worst part was the thought of that needle being stuck through my abdomen." given this description, katrina appears to have undergone a(n):

amniocentesis.

Explanation:

Amniocentesis is a medical procedure performed to obtain a sample of amniotic fluid (the fluid from the bag that bathes the fetus). The procedure is performed using an ultrasound device to guide a needle through the maternal abdomen into the amniotic cavity. When the needle reaches the amniotic cavity, about 20 ml of aspiration fluid is aspirated.

Katrina probably went through an amniocentesis process, so she felt uncomfortable with the needle in her abdomen.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )