1. What type of information does a pedigree contain?2.How do you show the presence of a trait in a pedigree?3. How do you denote males and females in a pedigree?4. From your pedigree, is the presence of dimples a dominant or recessive trait?5. How could examining a family pedigree be helpful to a couple wanting to have children?
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1). Pedigree contains information about genetic diseases, that runs in a family. Pedigree is never drawn for a single person.
2). Shaded figures are used to show a trait.
3). Male are square, females are circles.
4). Dominant or recessive traits are identified in the following way:
a). If the trait is present in all generations of the family then that trait is said to be dominant.
b). If the trait is present in some generation and is not there is some then the trait is called recessive.
5). A family pedigree can be helpful to a couple wanting to have children as it will show the probability of their children getting the genetic disease. For eg. If a wife is a carrier of colour blindness and husband is colour blind, then it will not be advisable to have children as, if the child is a girl then she would not survive because colour blind girls are not able to survive, they die soon after or before the birth. And if they have a boy then the boy would be colour blind.
2). Shaded figures are used to show a trait.
3). Male are square, females are circles.
4). Dominant or recessive traits are identified in the following way:
a). If the trait is present in all generations of the family then that trait is said to be dominant.
b). If the trait is present in some generation and is not there is some then the trait is called recessive.
5). A family pedigree can be helpful to a couple wanting to have children as it will show the probability of their children getting the genetic disease. For eg. If a wife is a carrier of colour blindness and husband is colour blind, then it will not be advisable to have children as, if the child is a girl then she would not survive because colour blind girls are not able to survive, they die soon after or before the birth. And if they have a boy then the boy would be colour blind.
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▶ pedigree analysis is the study of transmission of particular traits over the generations for finding out the possibility of their occurrence in the future generation...
▶importance
☀ it is used to know the possibility of expressive or recessive allele which may cause genetic disorder
☀ it shows the origin of trait and inheritance pattern of that trait in a family
☀ it predict the harmful effect of marriage between close relatives
☀ it extenously used in medical research ..
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