Gen466%20Exam%20I%20ans

Gen466%20Exam%20I%20ans - Gen 466 exam 1, 2.14.2008 Your...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Gen 466 exam 1, 2.14.2008 Your name _________________ 1 Genetics 466 exam #1. 1. Choose the best matching phrase in the right column for each of the terms in the left column. Write the corresponding number in the parenthesis after the term (1.5 pts each, 15 pts total) a. Chromosomal content typically observed in the gametes ( 5 ) 1. Euploidy b. Exact exchange of parts of two nonhomologous chromosomes ( 6 ) 2. Monosomy c, Exchange of chromosomal material between non homologous chromosomes with breaks near the centromere, associated with the loss of one set of centromeres ( 7 ) 3. Pericentric inversion d. In heterozygotes with a wild-type chromosome, one arm of the chromosome, excluding the centromere, synapses as a loop structure ( 8 ) 4. Triploid e. The relative position of the centromere in the chromosome changes after this chromosomal rearrangement ( 3 ) 5. Haploid f. Chromosomal content is increased by two chromosomes (of the same type) ( 11 ) 6. reciprocal translocation g. Chromosomal diploid content has duplicated ( 9 ) 7. Robertsonian translocation h. Chromosomal content in decreased by one chromosome ( 2 ) 8. Paracentric inversion i. Having complete sets of chromosomes ( 1 ) 9. Tetraploid j. Triplo X (XXX) syndrome ( 10 ) 10. Trisomy 11. Tetrasomy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Gen 466 exam 1, 2.14.2008 Your name _________________ 2 Multiple choice (Questions 2-10) Choose the answer that best matches each statement or question. Circle one and only one option. (4 pts ea.) 2) Astigmatism (A) is a dominant trait that is produced by unequal curvature of the cornea. Wavy hair results from the heterozygous expression of a pair of alleles h1 and h2. Homozygosity for h1 and h2 produces straight and curly hair, respectively. A wavy- haired woman who has astigmatism, but whose mother did not, marries a wavy-haired man who does not have astigmatism. What is the probability that their first child will be curly haired and nonastigmatic a. 1/8 b. 1/4 c. 3/8 d. 1/2 e. 5/8 Aa h1h2 f. x aa h1h2 m - P(aa h2h2) = 1/2 x 1/4 = 1/8 3) In a species of tropical fish, a colorful orange and black variety called montezuma can occur. True breeding montezuma lines of fish are never found. Instead, when two montezumas are crossed the following progeny classes are found: 2/3 of the progeny are montezuma and 1/3 show the wild-type gray-green color. The mutation is controlled by a single gene. This phenomenon can be best explained by proposing that the montezuma allele is: a. pleiotropic b. codominant together with the wild-type allele c. a loss of function mutation d. lethal when homozygous e. incompletely penetrant 4) In the cross AabbCcDd x aabbCcDd, the fraction of progeny that will exhibit the quadruple recessive phenotype is: a. 1/32 b. 1/64 c. 9/64 d. 1/256 e. 9/256 P(aabbccdd) = 1/2 x 1 x 1/4 x 1/4 = 1/32
Background image of page 2
Gen 466 exam 1, 2.14.2008 Your name _________________ 3 5) Consider the following human pedigree containing a Klinefelter syndrome male (XXY, indicated with the shaded square). A and B refer to codominant alleles of the X-
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

Gen466%20Exam%20I%20ans - Gen 466 exam 1, 2.14.2008 Your...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online