Use the guidelines in the table below to match the pedigree to the most likely m

Question

Use the guidelines in the table below to match the pedigree to the most likely mode of inheriftance. Pedigree characteristics of autosomal recessive, autosomal dominant linked dominant. and Y-Unked trails 5. When one parent is affected Autosomal recessive trait 1. Appears in both sexes with equal X-linked dominant trait 1. Both males and females are frequency 2. Trait tends to skip generations. 3. Affected offspring are usually (heterozygous) and the other parent is unaffetted approximately % of the offspring will be affected affected; often more females than males are affected. 2. Does not skip generations. 6. Unaffected parents do not Affected sons must have an affected mother; affected daughters must have either an affected mother or an affected father born to unaffected parents. 4. When both parents are transmit the trait heterozygous, approximately ¼ X-linked recessive trait 1. More males than females are of the offspring will be affected 5. Appears more frequently among the children of consanguine 3. Affected fathers will pass the 2. Affected sons are usually born trait on to all their daughters. marriages. Autosomal dominant trait 1. Appears in both sexes with equal to unaffected mothers: thus the trait skips generations. 4. Affected mothers if heterozygous) will pass the trait on to ' of their sons and '% of their daughters. 3. A carrier (heterozygous) mother produces approximately 2 affected sons. frequency 2. Both sexes transmit the trait to their offspring. 4. Is never passed from father tolinked trait 1. Only males are affected. 2. Is passed from father to all 3. Does not skip generations 3. Does not skip generations. 4. Affected offspring must have an 5. All daughters of affected fathers are carriers affected parent, unless they possess a new mutation.

Explanation / Answer

This pedigree chart is not for Autosomal recessive trait, as we can see affected children are born to affected parents, but in autosomal recessive trait, unaffected parents will give birth to affected children.

it is passed from father to son, which rules out the possiblity of X-linked recessive trait.

It is skipping generations, unaffected mother is giving rise to affected child, which rules out the possibility of X-linked Dominant trait.

Here both males and females are affected , which rules out Y linked disorders.

So the only correct option left here is the Presence of autosomal dominant trait.

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