This preview has intentionally blurred parts. Sign up to view the full document

View Full Document

Unformatted Document Excerpt

Biol 241, Spring 2008 Midterm Exam I Purdue ID: ___________________ 1 Question 1. Please circle the correct answers (10 points total, 1 point each) 1) Assuming that a G1 somatic cell nucleus in M. pilosula female contains 8 picograms of DNA. How much DNA would be expected in a Metaphase I cell of a female? A) 16 picograms B) 32 picograms C) 8 picograms D) 4 picograms 2) With dominant epistasis, a likely ratio resulting from a dihybrid cross would be: A) 9:3:4 B) 9:7 C) 12:3:1 D) 9:3:3:1 3) Which of the following does NOT always occur with gene conversion: A) Formation of heteroduplex B) Mismatch repair C) Generation of recombinant chromosomes D) Formation of Holliday structure 4) In Drosophila, sex is determine by a balance between the number of haploid sets of autosome and the number of A) Centromeres B) Telomeres C) X chromosomes D) Y chromosomes 5) When an organism gains or loses one or more chromosomes but not a complete haploid set, the condition is known as A) Polyploidy B) Euploidy C) Aneuploidy D) Trisomy Biol 241, Spring 2008 Midterm Exam I Purdue ID: ___________________ 2 6) Human patterned baldness is more prominent in males because it is a A) X-linked trait B) Y-linked trait C) Sex-influenced autosomal trait D) Conditional trait 7) The F factor that mediates the transferring of genetic materials during conjugation is a A) Bacteriophage B) Circular DNA C) Cell surface protein D) Single-Stranded RNA 8) The percentage of individuals that show at least some degree of expression of a mutant genotype defines A) Expressivity B) Genetic suppression C) Penetrance D) Incoomplete dominance 9) Which one of the following is Mendels First Law A) Unit factors in pairs. B) Dominance/Recessiveness C) Equal segregation D) Independent assortment 10) A loss-of-function mutation that causes a mutant phenotype when heterozygous is called A) Dominant active B) Dominant negative C) Haplo-insufficient D) Dominant suppressor Biol 241, Spring 2008 Midterm Exam I Purdue ID: ___________________ 3 Question 2. (10 points) In unicorns, two unlinked autosomal loci interact to determine the type of tail. One locus controls whether a tail is present at all; the allele for a tail (T) is dominant over the allele for tailless (t). If a unicorn has a tail, then alleles at a second locus determine whether the tail is curly or straight. Farmer Baldridge has two unicorns with curly tails. When he crosses these two unicorns, of the progeny have curly tails, have straight tails, and ... View Full Document

End of Preview

Sign up now to access the rest of the document