Purdue Bio 111 Exam 2 UPDATED
ACTUAL Questions and CORRECT
Answers
What is the phenotypic ratio from a cross between a red-eyed female and a white-eyed male? -
CORRECT ANSWER - 1 red-eyed female: 1 red-eyed male.
What does a lower case letter indicate in fly genetics? - CORRECT ANSWER - It
indicates a recessive mutant trait.
What is the expected result of a reciprocal cross between a white-eyed female and a red-eyed
male? - CORRECT ANSWER - 1 red-eyed female: 1 white-eyed male.
What is genetic linkage? - CORRECT ANSWER - The tendency of genes located close to
each other on the same chromosome to be inherited together.
What percentage of the human genome is coding? - CORRECT ANSWER - Less than 2%.
What is the significance of crossing over in genetics? - CORRECT ANSWER - It allows
genes on chromosomes to recombine, affecting inheritance patterns.
What happens during meiosis with complete linkage? - CORRECT ANSWER - All
offspring will show parental phenotypes with no recombinants.
What is the result of meiosis with incomplete linkage? - CORRECT ANSWER - Both
parental and recombinant types are produced.
How do multiple crossovers affect genetic linkage? - CORRECT ANSWER - They can
create parental types that may not be detected, leading to an appearance of independent
assortment.
,What is the first step in determining if genes are linked? - CORRECT ANSWER - Cross
true-breeding parents to make F1 offspring.
What is the role of test-crossing F1 offspring? - CORRECT ANSWER - To analyze the
offspring's phenotypes to determine linkage.
What is the expected outcome if a female is a carrier of a recessive allele? - CORRECT
ANSWER - The offspring will show a mix of phenotypes, including both red and white
eyes.
What is the expected outcome of a cross between a red-eyed female carrier and a white-eyed
male? - CORRECT ANSWER - 1 red female: 1 white female: 1 red male: 1 white male.
What is the significance of the term 'hemizygous' in male Drosophila? - CORRECT
ANSWER - Males have only one X chromosome, making them hemizygous for X-linked
traits.
What does the notation 'cin/cin' represent? - CORRECT ANSWER - It represents a
homozygous recessive genotype for the cinnabar eye mutation.
What does 'Cy' represent in fly nomenclature? - CORRECT ANSWER - It represents a
dominant mutant trait for curly wings.
What is the role of the BIOLOGY HELP ROOM? - CORRECT ANSWER - To provide
tutoring support for students Monday through Friday from 11 am to 4 pm.
What is the importance of accessing Connect assignments through Brightspace? - CORRECT
ANSWER - Grades will not be entered in the Brightspace gradebook if assignments are
not accessed through the Connect module.
, What is the expected outcome of a genetic mapping experiment? - CORRECT ANSWER -
To determine the relative positions of genes on a chromosome based on recombination
frequencies.
What does Independent Assortment predict about offspring genotypes? - CORRECT
ANSWER - It predicts equal numbers of parental and recombinant genotypes.
What occurs if the prediction of Independent Assortment is not upheld? - CORRECT
ANSWER - Only parental types are expected due to complete linkage.
What is the result of crossing two unknown mutants differing in two traits? - CORRECT
ANSWER - It yields F1 doubly heterozygous offspring.
What notation indicates two alleles at a locus in a genetic cross? - CORRECT ANSWER -
A slash (/) indicates two alleles at a locus.
What are the two models for allele linkage in a genetic cross? - CORRECT ANSWER - 1.
Unlinked alleles (separate chromosomes) 2. Linked alleles (same chromosome).
What is the expected outcome for gametes from F1 if alleles are unlinked? - CORRECT
ANSWER - Gametes will be produced in equal numbers.
What is the expected outcome for gametes from F1 if alleles are linked? - CORRECT
ANSWER - Gametes will not be produced in equal numbers.
What traits are being studied in the Drosophila cross mentioned? - CORRECT ANSWER -
Rotated abdomen (rt) and hairy wings (h).
What does a true-breeding fly with a rotated abdomen and hairy wings indicate? - CORRECT
ANSWER - It indicates both traits are recessive.
ACTUAL Questions and CORRECT
Answers
What is the phenotypic ratio from a cross between a red-eyed female and a white-eyed male? -
CORRECT ANSWER - 1 red-eyed female: 1 red-eyed male.
What does a lower case letter indicate in fly genetics? - CORRECT ANSWER - It
indicates a recessive mutant trait.
What is the expected result of a reciprocal cross between a white-eyed female and a red-eyed
male? - CORRECT ANSWER - 1 red-eyed female: 1 white-eyed male.
What is genetic linkage? - CORRECT ANSWER - The tendency of genes located close to
each other on the same chromosome to be inherited together.
What percentage of the human genome is coding? - CORRECT ANSWER - Less than 2%.
What is the significance of crossing over in genetics? - CORRECT ANSWER - It allows
genes on chromosomes to recombine, affecting inheritance patterns.
What happens during meiosis with complete linkage? - CORRECT ANSWER - All
offspring will show parental phenotypes with no recombinants.
What is the result of meiosis with incomplete linkage? - CORRECT ANSWER - Both
parental and recombinant types are produced.
How do multiple crossovers affect genetic linkage? - CORRECT ANSWER - They can
create parental types that may not be detected, leading to an appearance of independent
assortment.
,What is the first step in determining if genes are linked? - CORRECT ANSWER - Cross
true-breeding parents to make F1 offspring.
What is the role of test-crossing F1 offspring? - CORRECT ANSWER - To analyze the
offspring's phenotypes to determine linkage.
What is the expected outcome if a female is a carrier of a recessive allele? - CORRECT
ANSWER - The offspring will show a mix of phenotypes, including both red and white
eyes.
What is the expected outcome of a cross between a red-eyed female carrier and a white-eyed
male? - CORRECT ANSWER - 1 red female: 1 white female: 1 red male: 1 white male.
What is the significance of the term 'hemizygous' in male Drosophila? - CORRECT
ANSWER - Males have only one X chromosome, making them hemizygous for X-linked
traits.
What does the notation 'cin/cin' represent? - CORRECT ANSWER - It represents a
homozygous recessive genotype for the cinnabar eye mutation.
What does 'Cy' represent in fly nomenclature? - CORRECT ANSWER - It represents a
dominant mutant trait for curly wings.
What is the role of the BIOLOGY HELP ROOM? - CORRECT ANSWER - To provide
tutoring support for students Monday through Friday from 11 am to 4 pm.
What is the importance of accessing Connect assignments through Brightspace? - CORRECT
ANSWER - Grades will not be entered in the Brightspace gradebook if assignments are
not accessed through the Connect module.
, What is the expected outcome of a genetic mapping experiment? - CORRECT ANSWER -
To determine the relative positions of genes on a chromosome based on recombination
frequencies.
What does Independent Assortment predict about offspring genotypes? - CORRECT
ANSWER - It predicts equal numbers of parental and recombinant genotypes.
What occurs if the prediction of Independent Assortment is not upheld? - CORRECT
ANSWER - Only parental types are expected due to complete linkage.
What is the result of crossing two unknown mutants differing in two traits? - CORRECT
ANSWER - It yields F1 doubly heterozygous offspring.
What notation indicates two alleles at a locus in a genetic cross? - CORRECT ANSWER -
A slash (/) indicates two alleles at a locus.
What are the two models for allele linkage in a genetic cross? - CORRECT ANSWER - 1.
Unlinked alleles (separate chromosomes) 2. Linked alleles (same chromosome).
What is the expected outcome for gametes from F1 if alleles are unlinked? - CORRECT
ANSWER - Gametes will be produced in equal numbers.
What is the expected outcome for gametes from F1 if alleles are linked? - CORRECT
ANSWER - Gametes will not be produced in equal numbers.
What traits are being studied in the Drosophila cross mentioned? - CORRECT ANSWER -
Rotated abdomen (rt) and hairy wings (h).
What does a true-breeding fly with a rotated abdomen and hairy wings indicate? - CORRECT
ANSWER - It indicates both traits are recessive.
