21. The most kely mode of inheritance for the pedigree shown above? Aj autosomal

Question

21. The most kely mode of inheritance for the pedigree shown above? Aj autosomal recessive 81 autonomal dominant Dj X-linked dominant Y-inked 22. Ihe mest likely mode of inheritance of the trait in the above pedigree is A) autosomal recessive B) autosomal dominant C| x-linked recessive D) X-inked dominant E] Y-linked genetic factors, then in adoptive studies adoptees should revemble 23. If a trait is mostly determined by environment and not their biological paren a adoptive parents for this trait than C) the same as A) more than Monozygotc Dizygotic Migraine headaches Eye color 406 Clubloot High blood peessure Handedness traits listed in the table above are determined by environmental factors only A) 1 B)2 23

Explanation / Answer

21) D

The male parent is affected and all the females in the 1st generation is also affected, but none of the males. This indicate that the X chromosome in the male parent is having a problem. Hence the trait is X linked. Since the male parent is affected, it is clear that the trait is X linked and dominant.

22) A

Since both the parents are unaffected and only 1 out of the four offsprings are affected. This indicated that the trait is not a sex linked one. Hence it is an autosomal trait. Also since parents are unaffected and only 1 offspring is affected it indicates that the traint is a recessive one and the parents are carriers. Hence the given pedigree shows an autosomal recessive trait.

23) B

Since the adoptee and the adoptive parents live in the same environmental conditions, they exhibit more similarity in the trait determined by environmental factors compare to the biological parents who live in a different environmental condition. Hence similarity with biological parents are less than the adoptive parents.

24) C

Higher concordance rate in monozygotic (MZ) twins than in dizygotic (DZ) twins is often taken as an evidence for genetic component. MZ and DZ twins are equally similar environmentally. Measels, headedness and tuberculosis exhibit same concordance values for MZ and DZ. Hence these three traits are determined by environmental factors.

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