A woman with a genetic disease marries a man who does not carry them disease. It is not possible for their children to carry the disease. The disease must be --
a) sex-linked
b) recessive
c) dominant
d) caused by an extra chromosome
my answer is b recessive
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I answered this before. Carriers have the recessive gene in their genotype, but do not show the trait in their phenotype. Dominant leads to both expressed in genotype and phenotype, so they are not just carriers, but have the trait, C.
I have trait C
To determine the correct answer, we need to understand the inheritance pattern of the disease in question. In this case, the woman with the genetic disease marries a man who does not carry the disease. Since the question states that it is not possible for their children to carry the disease, it suggests that the disease is not present in their offspring. From this information, we can analyze the possible options:
a) Sex-linked: If the disease is sex-linked and the woman is the carrier, then there is a possibility that her male children could carry the disease. However, since the question states that their children cannot carry the disease, option a) is not correct.
b) Recessive: If the disease is recessive, both parents would need to be carriers of the gene. In this case, the woman has the disease, indicating that she must be homozygous for the recessive allele. The man does not carry the disease, suggesting that he is not a carrier. Since their children cannot have the disease, it indicates that they do not inherit the recessive allele from either parent. Therefore, option b) recessive is the correct answer.
c) Dominant: If the disease was dominant, it would mean that if one parent carries the gene, the disease would be present in their offspring. However, the question states that their children cannot carry the disease. So, option c) dominant is not the correct answer.
d) Caused by an extra chromosome: Genetic diseases caused by an extra chromosome, such as Down syndrome (Trisomy 21), do not follow the pattern mentioned in the question. Therefore, option d) caused by an extra chromosome is not the correct answer.
In conclusion, the disease in question is most likely inherited in a recessive manner (option b).