Achondroplasic dwarfism is a heterozygous condition. Embryos that are homozygous
ID: 91983 • Letter: A
Question
Achondroplasic dwarfism is a heterozygous condition. Embryos that are homozygous dominant do not survive. The recessive condition is normal. Male pattern baldness is largely an X-linked recessive disorder. A dwarf couple is planning to have a child. The man has normal hair production but the woman is bald. a. Construct a Punnett Square of the cross between the dwarf couple. b. What are the chances that if a child is born to this couple, she will be a non-dwarf daughter with normal hair production?Explanation / Answer
Answer:
Dwarf allele= D
Normal height= d
Pattern baldness= Xb
Normal allele= X
F1
XYDd (Man) x XbXbDd(female)
XbD
Xbd
XD
XXb DD (normal hair,dwarf)
XXb Dd (normal hair,dwarf)
YD
XbY DD (bald,dwarf)
XbY Dd (bald,dwarf)
Xd
XbX Dd (normal hair,dwarf)
XbX dd (normal hair,non-dwarf)
Yd
XbY Dd (bald,dwarf)
XbY dd (bald,non-dwarf)
There is chances of a female girl born to this couple having normal hair and nondwarf.
XbD
Xbd
XD
XXb DD (normal hair,dwarf)
XXb Dd (normal hair,dwarf)
YD
XbY DD (bald,dwarf)
XbY Dd (bald,dwarf)
Xd
XbX Dd (normal hair,dwarf)
XbX dd (normal hair,non-dwarf)
Yd
XbY Dd (bald,dwarf)
XbY dd (bald,non-dwarf)
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