Page 63 - Biology - XII

C. Comments on Pedigree (Fig. 11.3) (Mother has the trait, father does not have the trait)
1. It is pedigree of rolling of tongue in human.

2. The female parent (mother) has the ability of the tongue rolling.
3. The male parent (father) does not have the ability of rolling of the tongue.
4. None of the off spring/children of such parents have the ability of rolling of the tongue.

Check yourself whether you are a tongue-roller or not. You can make your family pedigree on tongue
rolling trait. Tongue-rollers can roll their tongue in ‘U’ tube like while the tongue-non-rollers cannot.

SPOT - 2

Heterozygous– blood group A

Heterozygous– blood group O

Blood group O Blood group A Blood group O Blood group A

Fig. 11.4

A. Comments on Pedigree (Fig. 11.4) of Blood Groups
1. It is the pedigree for blood group.

2. The mother is heterozygous for blood group A and father is homozygous for blood group 0.
3. The children of such parents will either be of O blood group or will be of A blood group.

A Pedigree Chart of Blood Groups

Parents Male

Female

Off spring

Male Female Male Female

Fig. 11.5

Blood group A

Blood group B

Fig. 11.6: Children will have blood group A, O

B. Comments on Pedigree (Fig. 11.5 and 11.6)
1. It is the pedigree for blood group.
2. The father is having A and mother is having O blood group, respectively.

3. The children of such parents will be having either blood group A or blood group O.

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