Need help on highschool biology homework, I don't really understand the material.
The description is: Hemophilia is caused by a recessive sex-linked gene. A man with no evidence of hemophilia married to a woman with no evidence of hemophilia. The man's father had hemophilia. The couple's second child had hemophilia. List all the genotypes of all the individuals. thanks in advance!
The description is: Hemophilia is caused by a recessive sex-linked gene. A man with no evidence of hemophilia married to a woman with no evidence of hemophilia. The man's father had hemophilia. The couple's second child had hemophilia. List all the genotypes of all the individuals. thanks in advance!
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as a basis haemophilia is carried by women,but doesnot show the diesease in them.disease shown only in men.as you know,in genetics we use these symbols
woman=XX
man=XY
recessive gene that gives haemophilia=h
dominant gene=H
this recessive factor is bonded with X allele
So
to show the disease a person must have both alleles ressesive= Xh
a carrier of this disease=XHXh
a healthy one with no haemophilia=XHXH OR XHY
therefore
genotypes of individuals are,
man's father=XhY
man=XHY
woman=XhXH
Child=XhY
Here as the man hadnt haemophilia child got it from the mother.she was the carrier of the disease.
hope you got it clear..
woman=XX
man=XY
recessive gene that gives haemophilia=h
dominant gene=H
this recessive factor is bonded with X allele
So
to show the disease a person must have both alleles ressesive= Xh
a carrier of this disease=XHXh
a healthy one with no haemophilia=XHXH OR XHY
therefore
genotypes of individuals are,
man's father=XhY
man=XHY
woman=XhXH
Child=XhY
Here as the man hadnt haemophilia child got it from the mother.she was the carrier of the disease.
hope you got it clear..