Page 66 - Biology - XII

B. Comments on Pedigree (Fig. 11.11)
1. It is the pedigree for widow's peak trait in human.

2. The female parent (mother) have the characteristic of widow’s peak.
3. The male parent (father) does not have the characteristic of widow’s peak.
4. Out of the four children of the parents, one male child (son) has the trait of widow’s peak.

Parents

Off spring

Fig. 11.12
C. Comments on Pedigree (Fig. 11.12)
1. It is a pedigree for widow’s peak trait in human.

2. The male parent (father) have the characteristic of widow’s peak.
3. The female parent (mother) does not have the characteristic of widow’s peak.
4. All the children of such a parent do not have the widow’s peak trait.

SPOT - 5

Colour blindness Test Spots

A Pedigree Chart on Colour blindness

P 1 Female colour-blind

Male colour-blind

F 1 Female carrier colour-blind

Normal male

Fig. 11.13: Marriage of colour-blind woman and normal man.

The defect is transmitted to son, granddaughter, and grandson.

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