©JUSTTRACY EXAM SOLUTIONS
07/11/2024 10:28
BIO 340 Mendelian Genetics Exam Questions And
Revised Answers
gene - answers✔✔-a segment of DNA encoding a polypeptide (or an RNA chain)
-the fundamental unit of heredity, which carries information from one generation to the next
what do alleles do and what are they? - answers✔✔-change their frequency in populations
-variants of genes
blending inheritance - answers✔✔held that traits of mother and father were blended and
permanently changed in the offspring (like mixing paint)
-couldn't explain brown cow and white cow making a brown cow or a two brown cows
making a white cow
key's to mendels success - answers✔✔1. chose a good study species
-makes plenty of data
-short generation time
-easy to arrange mating between species
2. he looked at discontinuous traits
3. studied true-breeding strains. matings within true-breeding strains always produce
offspring that resemble their parents
4. he studied one trait at a time
5. he counted offspring
continuous traits - answers✔✔traits which vary across an unbroken range of values
, ©JUSTTRACY EXAM SOLUTIONS
07/11/2024 10:28
discontinuous (discrete) traits - answers✔✔traits which show two or more distinct or separate
forms
hybrid - answers✔✔offspring of genetically dissimilar parents
monohybrid - answers✔✔hybrid between two strains that differ only at a single trait
dominance - answers✔✔a condition in which one member of an allele pair is manifested to
the exclusion of the other. the manifested allele is dominant and the hidden allele is recessive
mender's law of segregation - answers✔✔1. the two copies of a gene separate (segregate)
equally during gamete formation, so that half of the gametes carry one member of the pair,
and half carry the other member
2. during fertilization, gametes unite at random. that is, they fuse without regard to which
allele is carried by each one
phenotype - answers✔✔the observable characteristic of an organism
genotype - answers✔✔the specific allelic composition of an individual
In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a
true- breeding black strain is mated with a guinea pig from a true-breeding white strain. The
F1 progeny are all black. Two of the F1 progeny are mated with each other.
What proportion of the F2 progeny is expected to be white?
A) 1/4
B) 1/3 C) 1/2 D) 3/4 E) All - answers✔✔1/4
In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a
true- breeding black strain is mated with a guinea pig from a true-breeding white strain. The
F1 progeny are all black. Two of the F1 progeny are mated with each other.
07/11/2024 10:28
BIO 340 Mendelian Genetics Exam Questions And
Revised Answers
gene - answers✔✔-a segment of DNA encoding a polypeptide (or an RNA chain)
-the fundamental unit of heredity, which carries information from one generation to the next
what do alleles do and what are they? - answers✔✔-change their frequency in populations
-variants of genes
blending inheritance - answers✔✔held that traits of mother and father were blended and
permanently changed in the offspring (like mixing paint)
-couldn't explain brown cow and white cow making a brown cow or a two brown cows
making a white cow
key's to mendels success - answers✔✔1. chose a good study species
-makes plenty of data
-short generation time
-easy to arrange mating between species
2. he looked at discontinuous traits
3. studied true-breeding strains. matings within true-breeding strains always produce
offspring that resemble their parents
4. he studied one trait at a time
5. he counted offspring
continuous traits - answers✔✔traits which vary across an unbroken range of values
, ©JUSTTRACY EXAM SOLUTIONS
07/11/2024 10:28
discontinuous (discrete) traits - answers✔✔traits which show two or more distinct or separate
forms
hybrid - answers✔✔offspring of genetically dissimilar parents
monohybrid - answers✔✔hybrid between two strains that differ only at a single trait
dominance - answers✔✔a condition in which one member of an allele pair is manifested to
the exclusion of the other. the manifested allele is dominant and the hidden allele is recessive
mender's law of segregation - answers✔✔1. the two copies of a gene separate (segregate)
equally during gamete formation, so that half of the gametes carry one member of the pair,
and half carry the other member
2. during fertilization, gametes unite at random. that is, they fuse without regard to which
allele is carried by each one
phenotype - answers✔✔the observable characteristic of an organism
genotype - answers✔✔the specific allelic composition of an individual
In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a
true- breeding black strain is mated with a guinea pig from a true-breeding white strain. The
F1 progeny are all black. Two of the F1 progeny are mated with each other.
What proportion of the F2 progeny is expected to be white?
A) 1/4
B) 1/3 C) 1/2 D) 3/4 E) All - answers✔✔1/4
In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a
true- breeding black strain is mated with a guinea pig from a true-breeding white strain. The
F1 progeny are all black. Two of the F1 progeny are mated with each other.
