Jennifer's baby brother had infantile tay-sachs disease (tsd), but jennifer did not have the disease. when jennifer grew up and got married, her third child also had infantile tsd. how is this possible?
a.
jennifer and her husband were both carriers of the allele.
b.
jennifer was a carrier of the allele for the disease, and her husband was not.
c.
jennifer's husband was a carrier of the allele for the disease, and jennifer was not.
d.
jennifer's husband had the disease, and jennifer did not have any alleles.

A

Explanation: Jennifer did not get it because it is not always a 100% that you will get the disease you can become a carrier though if you do not get it. Which is what happened to her, the child got it because the higher chance that had it chances were very high and through chance actually got it. Which is you want to look at this it can kinda explain.

Jennifer's baby brother: 78% Chance to get it, 56% Chance to turn into a carrier

Jennifer herself: 67% Chance to get it, 89% Chance to turn into a carrier

Jennifer's husband: I wouldn't know his chance but only estimate it. 45% Chance to get it, 59% Chance to turn into a carrier.

b - the respond is innate and varies over time.

good luck!

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.