Question

Draw a pedigree to depict the following family: One couple has a son and a daughter with normal skin pigmentation. Another couple has one son and two daughters with normal skin pigmentation. The daughter from the first couple has three children with the son of the second couple. Their son and one daughter have albinism; their other daughter has normal skin pigmentation.

Answer 1

Answer:

The required pedigree is given in the attachment:

Refer to the key for understanding symbols.

Explanation:

• A record of occurrence  of a trait in several generation of a human family is called pedigree analysis.
• It is quite easy to identify some forms of inheritance from study of pedigrees.
• The pedigree analysis is useful in sexually reproducing organism where number of offspring is small.
• It also helps us in giving information about the genotype of an individual; for trait under investigation.
• It also provides information to the would be couples regarding the danger of certain genetic defect which might run in their family.

Answer 2

A pedigree to depict the given family: family pedigree for albinism is attached.

Pedigree analysis is a way to use describe family histories of genetic traits over multiple generations to explain inheritance patterns of traits.

• It helps in predicting the chance of offspring having a particular genetic trait.

• An autosomal dominant trait is one that appears in every generation; 50% of the children of an affected individual are also predicted to be affected.
• An autosomal recessive trait is one that tends to skip generations because when unaffected heterozygous carriers mate, they can have children affected by the trait.
• albinism is a genetic disorder or condition that is passed on in an autosomal recessive inheritance pattern.
• A child has to get 2 copies of the gene that causes albinism each from each parent to have the condition.

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