03-02-2017, 12:46 AM
(02-28-2017, 10:13 PM)SunilNagpal Wrote:(02-28-2017, 10:04 PM)CHANDA7 Wrote: Sir,Perfectly right, female non carrier thing is not needed here. Thanks for correcting me. Even if the first mother is a carrier, isn't there always a possibility to have carrier only female progenies? I mean birth of each son/ daughter is an isolated event and there always exists a possibility of unaffected females by being a carrier...
In this case the male individuals of the first generation will not be affected, because their x chromosome comes from mother and none of them is affected....
Sunil Sir,
I went through a video on NPTEL course "Human Molecular Genetics" which is on pedigree analysis at this link :
http://nptel.ac.in/courses/102104052/5
Between minute 32 and 33 of the video professor says that the carriers in "x linked recessive condition" are denoted by a "dot within the circle".
Can we challenge the question giving the reason that no clear indication is given if any of the females in the given pedigree are carriers thus X linked recessive condition was not indicative from the given pedigree.
I think this reason should hold in favour of us because it is in the NPTEL cource lecture.
I also found a video and webpage at the below links explaining the same pedigree as in the gate question"
https://migrc.org/Library/Ylinked.html
https://www.youtube.com/watch?v=a0mjmNiRg7w