Pedigree Chart Analysis
1. How can you tell if a couple is married on a pedigree?
2. Draw a pedigree that represents Mary married to Greg and with 2 sons (Scott and Tyler) and 1 daughter (Karen).
Label the pedigree with the names of the people.
Use Figure 3 to answer the following questions:
I
Figure 3
1
2
II
1
3.
4.
5.
6.
2
3
4
Which person is the son-in-law (Name him by generation # and person #)?
To whom is he married (Name her by generation # and person #)?
What sex is their child?
Are there any carriers for the disease represented by this pedigree?
In humans, albinism is a recessive trait. The disorder causes a lack of pigment in the skin and hair, making an albino appear very pale with
white hair and pale blue eyes. This disorder also occurs in animals, a common albino found in a laboratory is the white rat. The pedigrees below
trace the inheritence of the allele that causes albinism.
7. Given the following genotypes, describe the phenotypes (normal or albino)
AA =
Aa =
aa =
8. How many children does this family have?
9. How many sons does this family have?
10. How many of the children have albinism?
Answer the following questions using the pedigree chart. When naming individuals, put their generation first and then their number: Ex. IV-3
1
= Huntington’s
Disease
2
I
1
2
3
4
5
4
5
6
7
II
III
1
2
3
Which members of the family above are afflicted with Huntington’s Disease?
Of the original parents, which parent had Huntington’s disease?
How many children did individuals I-1 and I-2 have?
(a) How many girls did II-1 and II-2 have?
(b) How many have Huntington’s Disease?
15. How is individual III-2 and II-4 related?
16. How is individual I-2 and III-5 related?
11.
12.
13.
14.
8