To infer:
The type of inheritance pattern as represented in the given pedigree.
Introduction:
Scientists study family history using a diagram that traces inheritance of a particular trait through several generations. Such diagrams are called pedigree. A pedigree uses symbols to illustrate the inheritance of trait. By analyzing the pedigree we can infer the genotypes by observing the
Answer to Problem 38A
The given pedigree illustrates inheritance of a rare genetic disorder calledTay-Sachs disease. It is a recessive genetic disorder.
Explanation of Solution
Tay-Sachs disease- The given pedigree illustrates inheritance of a rare genetic disorder. Tay-Sachs disease is caused by lack of an enzyme involved in lipid
In this diagram, one child (II3) expresses the disease and others(II1, II2, II4) do not have the disease. The parents (I1 and I2) are carriers of the disease as circles and squares are half filled. Hence we can say that the disorder is a recessive genetic disorder because a recessive genetic disorder will have a carrier. The parents are unaffected but their child is affected indicating that each parent carries a recessive allele; i.e they are heterozygous for the disease causing gene. Recessive disorders are expressed only in homozygous condition. Hence II3 expresses the disease. It must be homozygous for recessive allele.
Chapter 14 Solutions
Biology Illinois Edition (Glencoe Science)
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