Genetics TTU Exam 2 Questions &
Answers (Grade A+)
True of False: Although a diploid organism can have no more than 2
alleles at a locus, there may be many alleles for a single locus within
a population -
correct answer ✅True
First Category that extends mendel's hereditary concepts -
correct answer ✅relationships between alleles of a single gene
that are other than completely dominant and completely recessive
2nd category that extends mendel's hereditary concepts -
correct answer ✅hereditary of traits that are influenced by alleles
of 2 or more genes- gene interactions
gene interactions -
correct answer ✅any of several ways different genes can
collaborate or interact with one another or within nongenetic
(environmental) factors to influence the expression of a phenotypic
character
true or false: 2 alleles for a given population cant exist for a given
locus within the population -
correct answer ✅false: there may be more than 2 alleles for a
given locus within the population
,Genetics TTU Exam 2 Questions &
Answers (Grade A+)
True or False: dominance of one allele over another may be
complete -
correct answer ✅dominance of one allele over another may not
be complete
True or False: dominance of one allele over another may be
complete -
correct answer ✅False: dominance of one allele over another may
not be complete
Can the expression of a trait be dependent on the interaction of 2
or more genes, on the interaction of genes with non-genetic
factors, and both? -
correct answer ✅Yes
complete dominance -
correct answer ✅makes the phenotype of a heterozygous
organism indistinguishable from that of an organism homozygous
for the dominant allele; thus, only organisms homozygous for the
recessive allele display the recessive phenotype
,Genetics TTU Exam 2 Questions &
Answers (Grade A+)
The dominance of one allele over another is determined by? -
correct answer ✅it is determined by the activity of the protein
products of the allele- by the manner in which the protein products
of alleles work to produce the phenotype
Haplosufficient -
correct answer ✅one (haplo) copy is sufficient to produce the
wild-type phenotype in the heterozygous genotype
Haploinsufficient -
correct answer ✅a single copy isn't sufficient to produce the wild-
type phenotype in the heterozygous genotype
loss of function mutation -
correct answer ✅results in a significant decrease or in the
complete loss of the functional activity of a gene product
gain-of-function mutation -
correct answer ✅identify alleles that have acquired a new function
or have their expression altered in a way that gives them
substantially more activity than the wild-type allele
, Genetics TTU Exam 2 Questions &
Answers (Grade A+)
null mutation (amorphic mutation) -
correct answer ✅A loss-of-function mutation that results in a
complete loss of gene function in comparison to the wild-type gene
product
leaky mutation (hypomorphic mutation) -
correct answer ✅a mutant whose phenotype is similar to but less
than the wild-type phenotype
True or false: A greater percentage of activity from a leaky allele
results in a less severely affected phenotype than when the
mutation incurs a more substantial loss of function -
correct answer ✅true
dominant negative mutation -
correct answer ✅Multimeric proteins, composed of 2 or more
polypeptides that join together to form a functional protein.
Consequence of some change that prevents the polypeptides from
interacting normally to produce a functional protein.
hypermorphic mutation -
correct answer ✅produce more gene activity per allele than the
wild type and are usually dominant
Answers (Grade A+)
True of False: Although a diploid organism can have no more than 2
alleles at a locus, there may be many alleles for a single locus within
a population -
correct answer ✅True
First Category that extends mendel's hereditary concepts -
correct answer ✅relationships between alleles of a single gene
that are other than completely dominant and completely recessive
2nd category that extends mendel's hereditary concepts -
correct answer ✅hereditary of traits that are influenced by alleles
of 2 or more genes- gene interactions
gene interactions -
correct answer ✅any of several ways different genes can
collaborate or interact with one another or within nongenetic
(environmental) factors to influence the expression of a phenotypic
character
true or false: 2 alleles for a given population cant exist for a given
locus within the population -
correct answer ✅false: there may be more than 2 alleles for a
given locus within the population
,Genetics TTU Exam 2 Questions &
Answers (Grade A+)
True or False: dominance of one allele over another may be
complete -
correct answer ✅dominance of one allele over another may not
be complete
True or False: dominance of one allele over another may be
complete -
correct answer ✅False: dominance of one allele over another may
not be complete
Can the expression of a trait be dependent on the interaction of 2
or more genes, on the interaction of genes with non-genetic
factors, and both? -
correct answer ✅Yes
complete dominance -
correct answer ✅makes the phenotype of a heterozygous
organism indistinguishable from that of an organism homozygous
for the dominant allele; thus, only organisms homozygous for the
recessive allele display the recessive phenotype
,Genetics TTU Exam 2 Questions &
Answers (Grade A+)
The dominance of one allele over another is determined by? -
correct answer ✅it is determined by the activity of the protein
products of the allele- by the manner in which the protein products
of alleles work to produce the phenotype
Haplosufficient -
correct answer ✅one (haplo) copy is sufficient to produce the
wild-type phenotype in the heterozygous genotype
Haploinsufficient -
correct answer ✅a single copy isn't sufficient to produce the wild-
type phenotype in the heterozygous genotype
loss of function mutation -
correct answer ✅results in a significant decrease or in the
complete loss of the functional activity of a gene product
gain-of-function mutation -
correct answer ✅identify alleles that have acquired a new function
or have their expression altered in a way that gives them
substantially more activity than the wild-type allele
, Genetics TTU Exam 2 Questions &
Answers (Grade A+)
null mutation (amorphic mutation) -
correct answer ✅A loss-of-function mutation that results in a
complete loss of gene function in comparison to the wild-type gene
product
leaky mutation (hypomorphic mutation) -
correct answer ✅a mutant whose phenotype is similar to but less
than the wild-type phenotype
True or false: A greater percentage of activity from a leaky allele
results in a less severely affected phenotype than when the
mutation incurs a more substantial loss of function -
correct answer ✅true
dominant negative mutation -
correct answer ✅Multimeric proteins, composed of 2 or more
polypeptides that join together to form a functional protein.
Consequence of some change that prevents the polypeptides from
interacting normally to produce a functional protein.
hypermorphic mutation -
correct answer ✅produce more gene activity per allele than the
wild type and are usually dominant
