BIO 342: Genetics - Exam 2 Miami University
Questions with Correct Answers
Principle of segregation Correct Answer ✓✓ Alleles separate during
meiosis
Independent assortment Correct Answer ✓✓ Alleles at one locus sort
independently from alleles at another locus
Recombination Correct Answer ✓✓ Alleles sort into new combinations
Linked genes separate together and crossing over produces
recombination between them Correct Answer ✓✓ linked genes are
found in the same loci of chromosomes
complete linkage leads to noncombinant gametes and noncombinant
progeny
Crossing over leads to ____; if crossing over occurs between two
normally linked loci, they will sort ____ Correct Answer ✓✓
recombination; independently
calculating recombination frequency Correct Answer ✓✓ RF = (#
recombinant progeny / total # of progeny) x 100
, coupling (cis configuration) Correct Answer ✓✓ one chromosome
contains both wild-type alleles, one chromosome contains both mutant
alleles
repulsion (trans configuration) Correct Answer ✓✓ wild-type allele and
mutant allele are found on the same chromosome
genetic maps are determined by ____ Correct Answer ✓✓ recombinant
frequency
genetic map Correct Answer ✓✓ an ordered list of the genetic loci
along a particular chromosome
steps in determining gene order in three-point cross Correct Answer ✓✓
1. identify recombinant progeny (two most numerous phenotypes)
2. identify the double-crossover progeny (two least numerous
phenotypes)
3. compare the phenotypes of double-crossover progeny with the
phenotypes of recombinant progeny - they should be alike in two
characteristics and differ in one
Recombinant frequency allows us to predict ____ for a cross with linked
genes Correct Answer ✓✓ expected offspring
Questions with Correct Answers
Principle of segregation Correct Answer ✓✓ Alleles separate during
meiosis
Independent assortment Correct Answer ✓✓ Alleles at one locus sort
independently from alleles at another locus
Recombination Correct Answer ✓✓ Alleles sort into new combinations
Linked genes separate together and crossing over produces
recombination between them Correct Answer ✓✓ linked genes are
found in the same loci of chromosomes
complete linkage leads to noncombinant gametes and noncombinant
progeny
Crossing over leads to ____; if crossing over occurs between two
normally linked loci, they will sort ____ Correct Answer ✓✓
recombination; independently
calculating recombination frequency Correct Answer ✓✓ RF = (#
recombinant progeny / total # of progeny) x 100
, coupling (cis configuration) Correct Answer ✓✓ one chromosome
contains both wild-type alleles, one chromosome contains both mutant
alleles
repulsion (trans configuration) Correct Answer ✓✓ wild-type allele and
mutant allele are found on the same chromosome
genetic maps are determined by ____ Correct Answer ✓✓ recombinant
frequency
genetic map Correct Answer ✓✓ an ordered list of the genetic loci
along a particular chromosome
steps in determining gene order in three-point cross Correct Answer ✓✓
1. identify recombinant progeny (two most numerous phenotypes)
2. identify the double-crossover progeny (two least numerous
phenotypes)
3. compare the phenotypes of double-crossover progeny with the
phenotypes of recombinant progeny - they should be alike in two
characteristics and differ in one
Recombinant frequency allows us to predict ____ for a cross with linked
genes Correct Answer ✓✓ expected offspring
