Study the two pedigrees (I and J) below. Both pedigrees illustrate the same trai

Question

Study the two pedigrees (I and J) below. Both pedigrees illustrate the same trait. Consider each of the four patterns of inheritance and Y-linked inheritance and try to identify the inheritance pattern illustrated by these two pedigrees. For each pattern, determine if it is (1) not possible, (2) possible but not likely, or (3) possible for these pedigrees. Explain your responses, stating specific examples to support your explanation.

Autosomal Dominant

Autosomal Recessive

X-Linked Dominant

X-Linked Recessive

Y-Linked

Examine the two expanded pedigrees that have been projected on the screen. There is something unusual in the inheritance pattern in these pedigrees. What is it?

Examine each instance where the trait is passed to offspring in Pedigrees I and J. From which parent is the trait inherited?

Explanation / Answer

In pedigree I it is a X linked dominant trait which is inherited from the mother. it is like maternaly inherited diabetes and deafness. basically all the children will inherit it but the sons will not pass it to the future generations.

The second is also anX linked trait but it is recessive and hence has not affected the other memebers of the future generation since the mothers other X chromosome has protected the children since maybe the mother is not even a carrier . The father donates the Y chormosomes to the boys and hence they remain unaffected

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