A woman with a genetic disease marries a man who does not carry the disease. It is not possible for their children to carry the disease. The disease must be

a) sex - linked

b) recessive

c) dominant

d) cause by an extra chromosome

I think the answer is recessive, can someone please check to see if that's right? Thanks!

This is very difficult. Forgive me if i am wrong. So there is a chance that the children may/may not have the disease.

However, it is possible that the disease is NOT Dominant. Because if it was, then the children would have the disease. SO the answer is B if i am correct.

With all due respect, can someone please check my answer???

Yes, you are correct. The disease must be recessive because in order for their children to have the disease, both parents would have to pass on the affected allele. Since the man does not carry the disease, he cannot pass it on to their children.

To determine the correct answer, let's analyze the information provided. We are told that the woman has a genetic disease and the man does not carry the disease. We are also told that it is not possible for their children to carry the disease. Based on this information, we can rule out options a) sex-linked and d) caused by an extra chromosome.

Now let's consider the remaining options: b) recessive and c) dominant. In genetics, diseases are generally classified as either recessive or dominant based on how they are inherited.

If the disease were dominant, it would mean that only one copy of the disease-causing gene would be sufficient for a child to develop the disease. In this case, if the woman had the disease and it was dominant, it would be possible for their children to carry the disease, even if the man did not have it. However, since it is not possible for their children to carry the disease, we can conclude that the disease is not dominant.

That leaves us with the option b) recessive. In the case of a recessive disease, both copies of the gene (one from the father and one from the mother) must be mutated for the child to have the disease. If the woman has a recessive genetic disease and the man does not carry it, their children would not be able to inherit the disease since they would need both copies of the disease-causing gene. Therefore, the correct answer is b) recessive.

In summary, based on the information provided, the correct answer is b) recessive.