<prompt> An affected male infant born to normal parents could be an example of all of the following, except -An Autosomal dominant disorderAn Autosomal recessive disorderA polygenic disorderA veically transmitted disorder  <response>: 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. 