a child was diagnosed with a rare genetic disease. niether parent has this disease.the disorder was inherited
samm_101_biotch
dominant and carried by one parent
recessive and is carried by both parents
sex-linked and inherited from the father only
the result of a mutation in the child because niether parent has the disease
I am not sure what you are asking…..
Are you wondering if the child was adopted to have the disease?
confusing…did you use the punnet square in getting those infos?..
if not, try to use it..its the simpliest..but, you’ll know the simple answer to the hardest unanswered question..’ ‘,)
I say recessive and carried by both parents. Since the disease was inherited and neither parent have it, they have to be carriers of the disease which would make it recessive.
If this is a multiple choice question it could be B or C.
C because the disease is recessive and dad had it. Dad did have it because he was heterozygous but he could pass a recessive to child. Now only the son would have it though because the disease would be on the X chromosome.
B because if the disease was homozygous recessive and kid has it that means kid got two recessives. And in order for child to get it parent must have the recessive allele. Having the recessive alleles and the disease being homozygous recessive implies parent doesn’t it it.
This is a very poorly worded question. But judging from the question “rare” would imply B more so than C. Homozygous recessive disorders are, by and large, more rare than Sex-linked disease.
The answer would be that the gene for the disorder is “recessive and is carried by both parents.” Since neither parent is affected, the gene cannot be dominant. Since the question says the disease was inherited, it has to be something to do with the parents’ genes and cannot be a mutation.
The child inherited recessive genes for the disease from both parents and so was affected by the disease.
The disease is recessive and carried by both parents. They are eterozygous for the gene, having the dominant and the recessive alleles and the child inherited the recessive alleles from both of them.
However, since it is not specified which disease it is, it could be that the parents are both recessive and a mutation happened in the child, conferring the protein encoded by the recessive allele a dominant behaviour which led to the appearance of the desease. This answer is less likely than the “recessive and is carried by both parents”.
It cannot be “dominant and carried by one parent” because this one should have the desease (unless the penetrance and expresivity are very low).
It cannot be sex-linked AND inherited by the father because the father has only one X and one Y: if the gene is on either of these chromosomes, the father should show the deseased phenotype; it could be sex-linked and inherited from the mother (because the mother has two X and then she could have the dominant and the recessive alleles but pass the recessive to the child, who would show the desease if he is a boy but not if she is a girl) but this answer is not contemplated in your test.