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Beadle and Tatum used mutants with mutations in the niacin biosynthesis pathway to work out the steps in the pathway. A single mutation can have many phenotypic effects (pleiotropy).
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function of the interaction of alleles; similarly, epistasis is a function of the interaction of nonallelic genes 22 37
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PROBLEM 1: In corn, rough sheath (rs) is recessive
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crcr (smooth sheath, midrib absent, crinkled leaf); rsrs Mrlmrl Crcr (rough sheath, midrib present, smooth leaf); rsrs Mrlmrl crcr (rough sheath, midrib present, crinkled leaf); rsrs mrlmrl Crcr (rough sheath, midrib absent, smooth leaf); and rsrs mrlmrl crcr (rough sheath, midrib absent, crinkled leaf). Each should make up one-eighth of the total number of offspring.
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PROBLEM 2: Summer squash come in three shapes: disk, spherical, and elongate. In one experiment, researchers crossed two squash plants with disk-shaped fruits. The rst 160 seeds planted from this cross produced plants with fruit shapes as follows: 89 disk, 61 sphere, and 10 elongate. What is the mode of inheritance of fruit shape in summer squash Answer: The numbers are very close to a ratio of 90:60:10, or 9:6:1, an epistatic variant of the 9:3:3:1, with the two 3/16ths categories combined. If this is the case, then the parent plants with disk-shaped fruits were dihybrids (AaBb). Among the offspring, 9/16ths had disk-
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to smooth sheath (Rs), midrib absent (mrl ) is recessive to midrib present (Mrl), and crinkled leaf (cr) is recessive to smooth leaf (Cr). (Alleles are named for the mutants, which are all recessive.) What are the results of testcrossing a trihybrid Answer: The trihybrid has the genotype Rsrs Mrlmrl Crcr. This parent is capable of producing eight different gamete types in equal frequencies, all combinations of one allele from each gene (Rs Mrl Cr, Rs Mrl cr, Rs mrl Cr, Rs mrl cr, rs Mrl Cr, rs Mrl cr, rs mrl Cr, and rs mrl cr). In a testcross, the other parent is a recessive homozygote with the genotype rsrs mrlmrl crcr, capable of producing only one type of gamete, with the alleles rs mrl cr. Thus, this cross can produce zygotes of eight different genotypes (and phenotypes), one for each of the gamete types of the trihybrid parent: Rsrs Mrlmrl Crcr (smooth sheath, midrib present, smooth leaf); Rsrs Mrlmrl crcr (smooth sheath, midrib present, crinkled leaf); Rsrs mrlmrl Crcr (smooth sheath, midrib absent, smooth leaf); Rsrs mrlmrl
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Tamarin: Principles of Genetics, Seventh Edition
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II. Mendelism and the Chromosomal Theory
2. Mendel s Principles
The McGraw Hill Companies, 2001
Exercises and Problems
shaped fruit, indicating that it takes at least one dominant allele of each gene to produce disk-shaped fruits (A-B-: AABB, AaBB, AABb, or AaBb). The 1/16th category of plants with elongate fruits indicates that this fruit shape occurs in homozygous recessive plants (aabb). The plants with spherical fruit are thus plants with a dominant allele of one gene but a homozygous recessive combination at the other gene (AAbb, Aabb, aaBB, or aaBb). In summary, then, two genes combine to control fruit shape in summer squash. The epistatic interactions between the two genes produce a 9:6:1 ratio of offspring phenotypes when dihybrids are crossed.
PROBLEM 3: A geneticist studying the pathway of synthesis of phenylalanine in Neurospora isolated several mutants that require phenylalanine to grow. She tested whether
Additive
Ph en yl py ru va te Ph en yl al an in e
Wild-type Mutant 1 Mutant 2 Mutant 3
each mutant would grow when provided additives that she believed were in the pathway of phenylalanine synthesis (see table); a plus indicates growth and minus indicates the lack of growth in the three mutants tested. Where in the pathway to phenylalanine synthesis does each of the additives belong, if at all Answer: The wild-type grows in the presence of all additives. This is not surprising since the wild-type can grow, by de nition, in the absence of all the additives because it can synthesize phenylalanine de novo. Mutant 1 cannot grow in the presence of any additive except phenylalanine, indicating that its mutation affects the step just before the end of the pathway at phenylalanine. In other words, each of the other additives occurs in the phenylalanine pathway before the point of the mutation in mutant 1. Mutant 2 can grow if given any additive but chorismate, indicating that chorismate is at the beginning of the pathway, and the mutation affects the pathway just after that step. Finally, mutant 3 can grow if given phenylpyruvate or phenylalanine, indicating that its mutation affects the step before phenylpyruvate and phenylalanine, but after the earlier part of the pathway. Putting all of this information together indicates that the pathway to phenylalanine, with mutants indicated, is: 2 3 1 chorismate prephenate phenylpyruvate phenylalanine
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