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Question
The pedigree chart given below shows a particular trait which is absent in parents but present in the next generatoin irrespective of sexes. Draw your conclusion on the basis of the pedigree.
Solution
The trait is autosome linked and recessive in nature. Both the parents are carrier (i.e., heterozygous) hence among offspring few show the trait irrespective of sex. The other offsprings are either normal or carrier.
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What is pedigree analysis? Suggest how such an analysis, can be useful.
A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be probability of her sons and daughters to be colour blind? Explain with the help of a pedigree chart.
Study the Pedigree chart given below and answer the questions that follow:
Symbols used in the given Pedigree Chart are as follows:
 |
Carrier male |
 |
Affected male |
 |
Normal male |
 |
Carrier female |
 |
Affected female |
 |
Normal female |
(a) On the basis of the inheritance pattern exhibited in this pedigree chart, what conclusion can you draw about the pattern of inheritance?
(b) If the female is homozygous for the affected trait in this pedigree chart, then what percentage of her sons will be affected?
(c) Give the genotype of offspring 1, 2, 3 and 4 in III generations.
OR
(c) In this type of inheritance pattern, out of male and female children which one has less probability of receiving the trait from the parents? Give a reason.
What should be the genotype of the indicated member?
