Among heritable diseases, which genotype can be present in an ind...

Question

Among heritable diseases, which genotype can be present in an individual without causing a disease phenotype in that individual?
a. heterozygous for a dominant disease;
b. homozygous for a dominant disease;
c. heterozygous for recessive disease;
d. homozygous for a recessive disease
e. all of the above

Accepted Answer

Hi everyone here's our next problem. There are diseases caused by mutated alleles. If the allele is recessive, it will cause disease in people who are blank on that mutated gene. So let's just think through this for calling from our content videos. Um With the recessive allele if the individual is heterocyclic asse. So they've got a dominant gene um for the normal state without the disease. And one recessive gene um one recessive mutated a leo that can cause the disease but in this case the dominant a little will mask mask that recessive mutant allele and the individual will not be affected in the case of a recessive value. So for the individual to show the disease to be affected, They need two copies of the mutant allele since it is recessive. So let's look over at our answer choices. We have choice A homesickness. So yes we know that for this person to be affected, they need two copies of the mutant allele. They must be homos I guess for that a little. So choice A is our answer here. Let's just walk through our others to see why they're not the right choice. Choice be hetero sickness. As we saw at their head arose. I guess the dominant allele will mask that mutant allele so they will not have the disease. Choice C says dominant. Well this just doesn't make sense Who are dominant on the mutated gene. It's not choice D says carrier. If they're a carrier of the mutated gene. While that being a carrier involves being hetero sickness, meaning you have inherited the gene, even though you don't have the disease and you can pass it along to offspring. So I guess as we saw, not the correct answer again, our correct answer is home, as I guess on the mutated gene choice. A see you in the next video.

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