Name: _______________________________ Date: ______________ Period: _____________
1.
Free earlobes are a dominant trait. Attached earlobes are a recessive trait. Use the symbols E and e
to label each of the numbered individuals. The shaded regions show individuals who are homozygous
recessive for attached ear lobes. They exhibit the trait being studied; they have attached ear lobes.
I.
2
1
II.
4
3
III.
5
6
9
8
7
10
IV.
Name: _______________________________ Date: ______________ Period: _____________
1.
Free earlobes are a dominant trait. Attached earlobes are a recessive trait. Use the symbols E and e
to label each of the numbered individuals. The shaded regions show individuals who are homozygous
recessive for attached ear lobes. They exhibit the trait being studied; they have attached ear lobes.
I.
II.
3
III.
6
5
IV.
2
1
10
7
4
8
9
2. Hemophilia is a disease in humans that causes the blood to clot slowly. It is a sex-linked trait that is caused by a
recessive gene on the X chromosome. Label each of the numbered individuals Using H for normal blood clotting and
h for hemophilia. Remember to label both the X and Y chromosome.
I.
II.
III.
2
1
3
7
4
8
5
9
IV.
6
10
11
2. Hemophilia is a disease in humans that causes the blood to clot slowly. It is a sex-linked trait that is caused by a
recessive gene on the X chromosome. Label each of the numbered individuals Using H for normal blood clotting and
h for hemophilia. Remember to label both the X and Y chromosome.
I.
II.
III.
IV.
2
1
3
7
4
8
5
9
6
10
11
2