ANSC 340 (LECTURES 2-8) EXAM
QUESTIONS AND ANSWERS (VERIFIED
AND UPDATED)
P(detection) = - ANS 1 - P(all dominant)^n
Confidence P(detection) =
(if all progeny show the dominant phenotype, how sure are we the suspect is homozygous?) -
ANS 99%
the efficiency of a progeny test in detecting a recessive allele is dependent on two components:
- ANS the number of progeny observed and the type of mate
how do we know they are known carriers? (2 ways) - ANS 1. they have homozygous recessive
parents
2. they've produced progeny with recessive phenotype before
the probability of the progeny of a known carrier is ____ - ANS 1/2 Bb + 1/2 BB
P(detection) = 1- (1/2)^n is true when you test mate your suspected heterozygote with _____ -
ANS homozygous recessive
Homozygous recessive mates with suspect Bb produces - ANS 1/2 Bb + 1/2 bb
@2026/2027 ALLRIGHTS RESERVED.
,known carrier mates with suspect Bb produces - ANS 3/4 B_ + 1/4 bb
most efficient way to test suspected alleles:
(most efficient form of progeny testing) - ANS homozygous recessive mating
homozygous recessive test mating requires more/less progeny? - ANS less
P(all dominant from both matings) = - ANS (1/2)^n X (3/4)^n
f( ) = ____ of matings to that genotype - ANS frequency
homozygous recessive mating requires only ______ progeny be observed to be more than 95%
sure the suspect is free from the problem allele - ANS 5 or 6
Known carriers require ____ progeny to be 95% sure that the suspect is free from the problem
allele - ANS 11
______ can genotype the causative polymorphism within a gene or can genotype a marker
which is in linkage with the causative allele - ANS marker-assisted selection
P(detection) = 1 - (3/4)^n is true when you test mate your suspected heterozygote with ____ -
ANS heterozygous
which type of mate is least efficient form of progeny testing? - ANS homozygous dominant
when 99% sure suspect is free from the problem allele.... - ANS no progeny with the recessive
phenotype can be observed
@2026/2027 ALLRIGHTS RESERVED.
, what are the 2 advantages of testing a marker vs causative polymorphism? - ANS 1. may be
cheaper
2. may be only thing you have (causative polymorphism not yet identified)
what are the 2 disadvantages of testing a marker vs causative polymorphism? - ANS 1. if not
in perfect linkage disequilibrium, there will be errors
2. can't glean physiological significance from a marker
when is MAS useful? - ANS if desirable trait is not observable until late in life or after death
(ex. carcass traits, arthritis, breast cancer)
Gene - ANS the fundamental physical and functional unit of heredity; a specific sequence of
thousands of nucleotides codes for proteins
locus - ANS a specific physical location on a chromosome; there may/may not be a known
gene at any given locus, although sometimes locus is used interchangeably with "gene"; may
have multiple alleles, and even multiple genes; plural: loci
allele - ANS alternative forms (base sequences) of the same gene; may differ in function or
chemical composition
Heterozygous - ANS Bb; Not the same allele on both chromosomes
homozygous - ANS BB or bb, the same allele on both chromosomes
transcription - ANS DNA --> RNA
translation - ANS RNA --> proteins; with help or tRNA and ribosomes, we get the production
of an amino acid chain
@2026/2027 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS (VERIFIED
AND UPDATED)
P(detection) = - ANS 1 - P(all dominant)^n
Confidence P(detection) =
(if all progeny show the dominant phenotype, how sure are we the suspect is homozygous?) -
ANS 99%
the efficiency of a progeny test in detecting a recessive allele is dependent on two components:
- ANS the number of progeny observed and the type of mate
how do we know they are known carriers? (2 ways) - ANS 1. they have homozygous recessive
parents
2. they've produced progeny with recessive phenotype before
the probability of the progeny of a known carrier is ____ - ANS 1/2 Bb + 1/2 BB
P(detection) = 1- (1/2)^n is true when you test mate your suspected heterozygote with _____ -
ANS homozygous recessive
Homozygous recessive mates with suspect Bb produces - ANS 1/2 Bb + 1/2 bb
@2026/2027 ALLRIGHTS RESERVED.
,known carrier mates with suspect Bb produces - ANS 3/4 B_ + 1/4 bb
most efficient way to test suspected alleles:
(most efficient form of progeny testing) - ANS homozygous recessive mating
homozygous recessive test mating requires more/less progeny? - ANS less
P(all dominant from both matings) = - ANS (1/2)^n X (3/4)^n
f( ) = ____ of matings to that genotype - ANS frequency
homozygous recessive mating requires only ______ progeny be observed to be more than 95%
sure the suspect is free from the problem allele - ANS 5 or 6
Known carriers require ____ progeny to be 95% sure that the suspect is free from the problem
allele - ANS 11
______ can genotype the causative polymorphism within a gene or can genotype a marker
which is in linkage with the causative allele - ANS marker-assisted selection
P(detection) = 1 - (3/4)^n is true when you test mate your suspected heterozygote with ____ -
ANS heterozygous
which type of mate is least efficient form of progeny testing? - ANS homozygous dominant
when 99% sure suspect is free from the problem allele.... - ANS no progeny with the recessive
phenotype can be observed
@2026/2027 ALLRIGHTS RESERVED.
, what are the 2 advantages of testing a marker vs causative polymorphism? - ANS 1. may be
cheaper
2. may be only thing you have (causative polymorphism not yet identified)
what are the 2 disadvantages of testing a marker vs causative polymorphism? - ANS 1. if not
in perfect linkage disequilibrium, there will be errors
2. can't glean physiological significance from a marker
when is MAS useful? - ANS if desirable trait is not observable until late in life or after death
(ex. carcass traits, arthritis, breast cancer)
Gene - ANS the fundamental physical and functional unit of heredity; a specific sequence of
thousands of nucleotides codes for proteins
locus - ANS a specific physical location on a chromosome; there may/may not be a known
gene at any given locus, although sometimes locus is used interchangeably with "gene"; may
have multiple alleles, and even multiple genes; plural: loci
allele - ANS alternative forms (base sequences) of the same gene; may differ in function or
chemical composition
Heterozygous - ANS Bb; Not the same allele on both chromosomes
homozygous - ANS BB or bb, the same allele on both chromosomes
transcription - ANS DNA --> RNA
translation - ANS RNA --> proteins; with help or tRNA and ribosomes, we get the production
of an amino acid chain
@2026/2027 ALLRIGHTS RESERVED.
