Haemophilia is an X-linked recessive condition - VCE - SSCE Biology - Question 3 - 2006 - Paper 1
Question 3
Haemophilia is an X-linked recessive condition. The following pedigree shows a portion of a family in which some members have haemophilia. Those on the pedigree with... show full transcript
Worked Solution & Example Answer:Haemophilia is an X-linked recessive condition - VCE - SSCE Biology - Question 3 - 2006 - Paper 1
Step 1
Use appropriate allele symbols from X^H, X^h and Y to indicate the genotype of each of the following individuals.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
I1: X^H X^h
I2: X^h Y
Step 2
The couple II1 and II2 have a son. What is the probability that the child has haemophilia?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The chance is 1 or 100% (that is, all sons will be haemophiliac).
Step 3
The couple II5 and II6 have a son. What is the probability that the child has haemophilia?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
1/2 or 50% chance of a child having haemophilia.
Step 4
Give a possible genotype for each of the four members of the family.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
