Big losses of genetic variation for the small populations are readily caused by
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Answer:
Explanation:
As the inheritance is X-linked,recesson so for expression of muscular dystrophy in any given muscle,
enh1+ /enh1 + = Shows muscular dystrophy in heart (Homozygous for -)
enh2+/enh2+ = Shows no muscular dystrophy in arms (Homozygous for +)
enh3-/enh3+ = variabl or mosaic for muscular dystrophy in leg muscles (Hetrozygous for enh3)