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CB 1.3 GENETIC VARIATION
TRACKING GENES
1
3 4 5 6 8
9 10 11 12 13 14
2
I
II
III
7
The Genetics of Freckles
Some people are more likely to get freckles than others, depending
on their genes and skin type. The main gene responsible for freckles
is called MC1R. It comes in two different versions: freckle (F) and
non-freckle (f). Both FF and Ff people have freckles. Anyone with at
least one copy of the freckle allele (F) will have freckles.
The pedigree chart below shows the inheritance of freckles in a
family.
1. How many generations are shown in the pedigree chart?
2. Is Individual 2 the grandmother or grandfather of Individual 14?
3. Does Individual 2 have freckles?
4. How many offspring did Individuals 1 and 2 have?
5. How many of the offspring of Individuals 1 and 2 have freckles?
6. Is Individual 8 related to individuals 1 and 2?
7. State the genotype and phenotype of Individual 1.
Phenotype:
Genotype:
Justify your answer.
8. State the genotype and phenotype of Individual 2.
Phenotype:
Genotype:
Justify your answer.
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