Preimplantation Genetic Diagnosis Presentation
Fig. 18. X-linked recessive inheritance has a somewhat different pattern of transfer from the dominant variety.
A. A carrier mother may transfer an abnormal X chromosome to the daughter, who, inheriting a healthy X chromosome from the father will become a carrier (A1). If the diseased chromosome is transferred to the son, who does not have a healthy X chromosome, he will have the full-blown disease (A3).
B. If a diseased father will transfer the abnormal X chromosome to his
daughters, they will become carriers (B1, B2), whereas the sons, inheriting
a healthy X chromosome from the mother and a healthy Y chromosome from
the father will be unaffected (B3, B4).
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