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BIO 325 - Fall 2008 - Sample questions - I Exam-1

BIO 325 - Fall 2008 - Sample questions - I Exam-1 -...

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GENETICS (BIO 325) Fall 2008 Sample questions - I Exam __________________________________________________________________________________________________ 1. In a family, both parents are heterozygous for the autosomal recessive allele for albinism. They have two children. What is the probability that both children will be phenotypically identical (pigmented or albinos) with regard to skin color? 2. α -thallasemia, a form of anemia, is inherited in humans as a recessive trait. Two normal parents have a child affected with α -thallasemia. If this couple has 3 additional children, what is the probability that none of these 3 children will be affected by α -thallasemia? 3. A corn plant of genotype A/a;B/B;C/c;D/d;E/e;f/f;G/g is selfed. What is the probability of producing a completely homozygous individual out of all possible offspring? Consider all the possible homozygous genotypes that can be obtained by selfing of this corn plant. (a) 0.013 (b) 0.031 (c) 0.008 (d) 0.062 4. For each of the terms in the left column, choose the best matching phrase in the right column. (a) Independent assortment (i) Alternate forms of a gene (b) Recessive (ii) Alleles of one gene separate into gametes randomly with respect to alleles of other genes. (c) Dihybrid cross (iii) The allele that does not contribute to the phenotype of the heterozygote. (d) Test cross (iv) A cross between parents that are heterozygous at two loci. (e) Alleles (v) The cross of an individual of ambiguous genotype with a homozygous recessive individual. 5. Indicate whether the following statements are true or false. (a) Human X-linked genes are hemizygous in males. (b) In Drosophila , females are the heterogametic sex.
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(c) If both parents are affected by an autosomal recessive trait, all their children will be affected.
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BIO 325 - Fall 2008 - Sample questions - I Exam-1 -...

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