wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A woman with normal vision marries a man with normal vision and gives birth to a colour blind son. Her husband dies and she marries a colour blind man. What is the probability of her children having the abnormality?

A
50% colour blind sons + 50% colour blind daughters
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
All sons colour blind and daughter carrier
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
All daughters colour blind and sons normal
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
50% sons colour blind and all daughters normal
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A 50% colour blind sons + 50% colour blind daughters
Colour blindness is a X-linked recessive disorder. Son gets its X chromosome from the mother, hence the normal mother of a colour blind son will be carrier (XcX). Among the children of a carrier female (XcX) and colour blind man (XcY), 50% sons and 50% daughters will be affected. Correct answer is option A.
Parent generation : "XcX" x "XcY"
Gametes :
XcX -->
XcY
Xc
X
Xc
XcXc
colour blind girl

XcX
carrier girl
YXcY
colour blind boy

XY
normal boy

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Sex Linked Inheritance in Humans
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon