Family pedigreeStudy of a phenotype in a family

Prof. Beatriz Duro

Colegio Internacional SEK Ciudalcampo

Family Pedigree Symbols

Woman that does not show

the studied phenotype

Man that does not show

the studied phenotype.

Woman that shows the

studied phenotype.

Man that shows the

studied phenotype.

Phenotype studied: Haemophilia

I

II

III

IV

1 2

1

1

1

2

2

2 3

3

3

4

4

5

Phenotype studied:

Color blindness

"My mother and my older sister can perfectly distinguish colors, but my father and my sister Julie have

the same problem as I do. Julie has 2 colorblind sons, yet her only daughter has perfectly normal vision. I

have a son and a daughter who both have normal vision, like their mother. Although my mother has

normal vision, her brother had the same problem I have."

p. 57

El daltonismo es un carácter que se hereda ligado al

sexo. ¿Qué datos apoyan esta afirmación?

El alelo responsable del daltonismo esdominante o recesivo?

II

III

IV

I

1 2

1

1

1

2

2

2 3

3

3

4

4 5

5

Phenotype studied: Color blindness