3, Duxthesne muscalar dystrophy IDMDI is a musdle wasing disene and ib an X-link

Question

3, Duxthesne muscalar dystrophy IDMDI is a musdle wasing disene and ib an X-linkead receuive disseder. A raan wish dhi disee has chiklren wish a woman who does noc have the disease buther her did. If hey had a on, who wauld be the dunce that he wwuld have DMD: Daugheer An chid: Consnuct a Pasnet squaec and deserraine the answes Chance son would hase DMD Chance daughier wwala huwe DMD Chance of any child haring DXMD . 4 Skin color s a compks trait and whike just a fow goe accvant for the majar dffeence berwen light and dark skin cnlat, drotrs of other gencs participae. Asume in this hypothatical sceruzia there are only w gs for skin colos A and B. Each gont ohicits incormplese aminencr AABB thomeypun daminam fes both genel resalts in the darke akin celer ind abs Quoemiorgous recessioe for both genesl resulks in the lighoes skin cokor. Tomss is heteroargous for both genes his partner, Hdp.heteuerpus for che A gene and hornoereeus recessive for the B gene. Conaruct a Punnett square showing the cross of this couple. Whar are the especud genocypes and phesotypa of the childiee this coepk coukd have Espected geratypos of children Espocted phenotypas af children

Explanation / Answer

1) Female offsprings acquire one X from their mother and one X from their father, Male offsprings acquire their only X from their father.  

The genotype of the male parent with DMD - XdY

The female parent will be a carrier for DMD, since her father had the disorder - XDXd

Xd Y XD XDXd - Carrier female XDY - Normal male Xd XdXd - Affected female XdY - Affected male

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