Genetics Exam 2

Topics: Gene, Allele, Meiosis Pages: 8 (1794 words) Published: December 4, 2014
BioSc 321General GeneticsExam 2Name __________________________________

Multiple Choice. (1 point each)

_____During anaphase of the mitosis ___.

A. DNA recombines
B. Sister chromatids move to opposite poles
C. The nuclear membrane disappears
D. RNA replicates
E. DNA content essentially doubles

_____During prophase of mitosis ___.

A. DNA recombines
B. Sister chromatids move to opposite poles
C. The nuclear membrane disappears
D. RNA replicates
E. DNA content essentially doubles

_____An autosome is ___.

A. a non-sex determining chromosome
B. an alternate form of a gene
C. another term for epistasis
D. present only in males and is responsible for sex determination E. found in mitochondria but not in nuclei

_____What ratios typically result from crosses dealing with a single genetic locus?

A. 9:3:3:1, 1:2:1
B.1:1:1:1, 1:4:6:4:1
C. 3:1, 1:1, 1:2:1
D.9:7, 12:3:1
E. 15:1, 1:2

_____With co-dominance, a likely ratio resulting from a monohybrid cross would be ___.

A. 3:3
B. 1:2:2:4
C. 1:2:1
D. 9:3:3:1
E. 3:1

_____A situation in which an organism has both haploid and diploid stages would be called ___.

A. multiple alleles
B. alternation of generations
C. codominance
D. incomplete dominance
E. hemizygosity

_____ An F2 generation in which the phenoypic ratio of the offspring is 9:7 is usually due to ___.

A. codominance
B. epistasis
C. dominance
D. recessiveness
E. additive alleles

____ In a complementation test the number of complementation groups indicates

A. the number of genes required for a specific phenotype
B. the penetrance of phenotype
C. the number of alleles for a gene
D. the number of chromosomes in an organism
E. the quantity of gene product required for a phenotype

_____Typical phenotypic ratios resulting from epistatic interactions in a monohybrid cross would be ___.

A. 9:3:3:1, 1:2:1
B. 1:1:1:1, 2:1
C. 9:3:4, 9:7
D. 3:1, 1:2:1
E. none of the above

_____Chromosomes that contain the same sets of genes and pair up in meiosis I are called ___?

A. homologous
B. heterologous
C. complementary
D. non-disjunctive
E. parallel

_____ In a complementation test

A. mutations that complement are allelic
B. mutations that complement belong to the same complementation group C. mutations that complement are in two different genes required for the wild-type phenotype D. mutations that are allelic are required for complementation

_____ The purpose for check points in the cell cycle is to

A. cause cells to grow out of control leading to cancers
B. stop mitosis to prevent chromosome duplication
C. stop DNA synthesis to prevent chromosome duplication
D. pause the cell cycle until all the necessary building blocks are synthesized E. give geneticists something else to study

_____ Which stage of prophase I of meiosis is characterized by the initiation of active pairing?

A. leptotene
B. zygotene
C. pachytene
D. diplotene
E. diakinesis

_____ Which stage of prophase I of meiosis is characterized by the initiation of chromosomal “thickening”?

A. leptotene
B. zygotene
C. pachytene
D. diplotene
E. diakinesis

_____ Which stage of prophase I of meiosis is characterized by fully compacted chromosomes ready to begin metaphase?

A. leptotene
B. zygotene
C. pachytene
D. diplotene
E. diakinesis
_____ The percentage of individuals with a given genotype who exhibit the phenotype associated with that genotype is called

A. penetrance
B. expressivity
C. incomplete dominance
D. co-dominance
E. lethality

_____ A situation where each allele produces a protein that can be detected in the heterozygote is called

A. penetrance
B. expressivity
C. incomplete dominance
D. co-dominance
E. lethality

_____ A situation in which an allele causes inviability when present in two doses is called

A. penetrance
B. expressivity
C. incomplete dominance
D. co-dominance
E. lethality

_____ An...
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