Principle of Inheritance and VariationEasyBloom L3
Question
If a colour blind woman marries a normal visioned man, their sons will be
Options
A.one-half colour blind and one-half normal
B.three-fourths colour blind and one-fourth normal
C.all colour blind
D.all normal visioned
Solution
Sol.(c) [Key Concept: X-linked Colour Blindness — Affected Mother] A colour blind woman has genotype X^c Xc (homozygous recessive). She passes Xc to ALL her sons. Her normal-visioned husband (XC Y) passes Y to all sons. Sons: all receive Xc from mother and Y from father → all are Xc Y → ALL COLOUR BLIND. The daughters receive Xc from mother and XC from father → all are XC Xc (carriers with normal vision).
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