MIDTERMBIOf3252008ANSWERS

MIDTERMBIOf3252008ANSWERS - 1 GENETICS BIOf325 Summer 2008...

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1 GENETICS – BIOf325 Summer 2008 Prof: Janice Fischer MIDTERM EXAM June 23, 2008 Name Janice Fischer GENETIC CODE WOBBLE RULES
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2 1. What aspect of chromosome behavior most clearly accounts for Mendel's law of equal segregation? (5) Homologs pair and then separate into different haploid cells during meiosis I. 2. What aspect of chromosome behavior most clearly accounts for Mendel's law of independent assortment? (5) Homologous chromosomes line up (with respect to up/down) independently of one another when they pair prior to meiosis I, such that maternal and paternal homologs do not all end up together in different haploid cells after meiosis I. 3. A and a and L and l are alternate alleles of two different plant genes on two different chromosomes . A and L are each dominant to a and l, respectively. The phenotypes associated with A and a are axial flowers and terminal flowers, respectively. The phenotypes associated with L and l are long stems and short stems, respectively. Consider the following dihybrid cross: P AAll X aaLL F1 AaLl (self) F2 A. What are the different gamete types that each of the parents (P) can produce and their frequencies? (2) Al (100%) and aL (100%) B. What are the different gamete types that the F1 can produce and their relative frequencies? (3) AL (25%), Al (25%), aL (25%), al (25%) C. What is the genotypic ratio of the F2? (3) 9 A_L_ : 3 aaL_ : 3 A_ll : 1 aall D. What is the phenotypic ratio of the F2? (2) 9 axial, long : 3 terminal, long : 3 axial, short : 1 terminal, short E. What is the probability of obtaining an AaLl plant in the F2? (5) The probability of Aa is ½ (1 AA: 2 Aa: 1 aa) and likewise the probability of Ll is ½ , and so the probability of AaLl is ½ X ½ = ¼ .
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3 4. G and H are two genes in a diploid plant. G is completely dominant to g, and H is completely dominant to h. Consider the following cross: P GGhh X ggHH G = green leaves g = yellow leaves F1 GgHh (self) H= hot pink flowers h = white flowers F2 A. Assuming that G and H are unlinked , indicate the genotypes of all of the different gamete types produced by the F1 and their relative frequencies. (5) GH (25%), Gh (25%), gH (25%) gh (25%)
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This note was uploaded on 08/18/2008 for the course BIO 325 taught by Professor Saxena during the Summer '08 term at University of Texas at Austin.

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MIDTERMBIOf3252008ANSWERS - 1 GENETICS BIOf325 Summer 2008...

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