An affected male infant born to normal parents could be an example of all of the following, except –
Correct Answer: An Autosomal dominant disorder
Description: Ans. is 'a' i.e., Autosomal dominant disorder In Autosomal dominant disorders individuals are affected in successive generations. The disease does not occur in the offspring of unaffected individuals' ? Autosomal dominant o If both parents are normal, the disease cannot be autosomal dominant because it is manifested in Heterozygous state, So, even a single gene affection amongst the allel will cause the disease to be manifested. To be normal, a person should have normal copy of both allel. If both parents are normal, that means there is no abnormal gene. Autosomal recessive o In autosomal recessive disorder, if both parents are carrier (phenotypically normal) 25% of child will develop disease. Polygenic disorder o A trait is called `polygenic' if multiple genes on thought to contribute to the phenotype. o Polygenic disorders include Hypeension Diabetes, Asthma o A male infant with asthma or diabetes may will be born to normal parents Veically transmitted disorder o Passage of disease causing agent (pathogen) `veically' from mother to baby during the perinatal period is called 'veical transmission'. o A veically transmitted agent might lie dormant in the mother and not manifest in her clinically (normal mother) but may manifest in the child.
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