recombination between homologues 2.5 pts D Question 46 If inheritance of Ratitit

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recombination between homologues 2.5 pts D Question 46 If inheritance of Ratititis disorder is X-linked recessive, then.. an affected daughter can only be produce when both mother and father are affected. unaffected mothers, but not unaffected fathers, could pass the disorder onto their sons. affected fathers, but not affected mothers, could pass the disorder onto their daughters. Oan affected son can only be produced when both mother and father are affected. D Question 47 2.5 pts What is the Proctorio is sharing your screen. Stop sharing Hide ? methylation of DNA repair mechanisms Flo 4) 6 8 0

Explanation / Answer

Ans. Correct option- A.

Given- the disorder is X-linked recessive. Since females (XX) have 2 X-chromosomes, they exhibit the disease condition only when they inherit two recessive alleles – one from each parent. The females with only 1 allele act as carrier but do not exhibit the disease condition because the presence of another normal (dominant) X-chromosome does not let the recessive allele express.

Therefore, for the female (daughter, XX) to be exhibiting the disease condition, she must inherit two recessive alleles – one from each parent.

#Option B, C, D- Incorrect. Males (XY) have only 1 X-chromosome. So, inheriting the X-chromosome with recessive allele from any parent always causes appearance of the disease condition.

So, an affected son may be produced when either the mother or the father, or both are affected.

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