Recent research has confirmed that baldness is an example of

Recent research has confirmed that baldness is an example of a sex linked trait. Is it possible for a couple, neither of whom is bald to produce: Bald son? explain using a Punnett square Bald daughter? explain using a Punnett square|

Solution

Ans.)

Lets Consider Baldness to be a disease.

Now Lets Consider

\"b\" -Healthy Allele Annotation(Without Baldness)

\"B\"-Diseased Allele Annotation(With Baldness)

\"X\"-X Chromosome

\"Y\"-Y Chromosome

\"XY\"-Male

\"XX\"-Female

Now, as sexlinked traits in diseased conditions are predominantly recessive, we have the following combinations-

a.) Couple could have a bald Son if, for example are X^bX^B or X^BX^B wife with Y from either of the two male combinations above, lets suppose X^BX^B crossed with X^bY

b.) Can have a bald girl if in couple Male is Diseased and Female is carrier or diseased.

Females		Males
XbXb	Healthy	XbY	Healthy
XbXB	Carrier	XBY	Diseased
XBXB	Diseased