37. Explain why males are more likely to have an x-linked disease than females?

Question

37. Explain why males are more likely to have an x-linked disease than females? Use the following to answer questions 38-42. Remember that "it's possible" is an answer choice. Chromosome from mother Chromosome from father BnH t Spots Teeth Horns Tail Absent (b) Present (B) Needle Teeth (N) Flat Teeth (n) Horns present (H) No horns (h) Long Tail (T) Short Tail (t) 38. Does this individual have a long or short tail? Explain 39. Did this individual's father have needle teeth? Yes, No or Maybe EXPLAIN. 40. Could this individual's mother have a long tail? Yes, No or Maybe EXPLAIN

Explanation / Answer

ANSWER 37.
Males are more likely to have an X-linked disease than females because males have only one copy of the X-chromosome, so in their case even an X-linked recessive disease is dominant because they do not have the functioning copy of the allele to carry out the effect.

ANSWER 38.
This individual has a long tail due to the presence of one dominat allele for Tail - Long Tail (T), from the mother, so the answer is Long Tail (T).

ANSWER 39.
The father gave an 'n' allele for flat teeth, the other allele could have been either 'n' or 'N', in which case the father could have needle teeth or flat teeth, so the answer is MAYBE.

ANSWER 40.
The mother gave a 't' allele for flat teeth, the other allele could have been either 't' or 'T', in which case the mother could have long tail or short tail, so the answer is MAYBE.

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