My Family Tree

By: Carlos San Martín Fdez.

What is a family tree?A family tree is a drawing or chart that shows how the

different members of a family are related to each other.

What is my trait?• My trait is “left thumb over right thumb.”

Autosomal dominant inheritance

(Me)

aa

Aa Aa Aa

Aa

Aa

Aa

Aaaa

aaaa aaaa

aa

aa

Left Thumb over Right Thumb (AA, Aa)Right Thumb Over Left Thumb (aa)