Genetics Exam questions and
answers graded A+
linked genes - ANS✅✅Genes located on the same chromosome that tend to be inherited together
in genetic crosses.
non recombinant gamete - ANS✅✅Gametes that only contain original combination of alleles, no
crossing over
nonrecombinant progeny - ANS✅✅Possesses the original combinations of traits possessed by the
parents
recombinant progeny - ANS✅✅The progeny with new combinations of traits formed from
recombinant gametes.
recombinant frequency - ANS✅✅the proportion of offspring of a genetic cross that have
phenotypes different from the parental phenotypes due to crossing over between linked genes
during gamete formation
coupling - ANS✅✅Most prevalent gametes are those with two dominant alleles or those with two
recessive alleles. Favors homozygous
repulsion - ANS✅✅Gametes containing one dominant and one recessive allele will be must
abundant. Favors heterozygous
genetic map - ANS✅✅An ordered list of genetic loci (genes or other genetic markers) along a
chromosome.
physical map - ANS✅✅A genetic map in which the actual physical distances between genes or
other genetic markers are expressed, usually as the number of base pairs along the DNA.
map unit - ANS✅✅The distance on a chromosome within which recombination occurs 1 percent of
the time
, centimorgan - ANS✅✅map unit used to measure distance between genes on a chromosome; one
unit of this corresponds to a 1% chance of recombination occurring between two genes
two point test cross - ANS✅✅A test cross used to identify genetic linkage between two genes and
to determine the recombination frequency between the linked genes
three point test cross - ANS✅✅A test cross designed to identify genetic linkage between three
genes and to determine the recombination frequency between the linked genes
interference - ANS✅✅A measure of the independence of crossovers from each other, calculated
by subtracting the coefficient of coincidence from 1
coefficient of coincidence - ANS✅✅ratio of observed double crossovers to expected double
crossovers
mapping function - ANS✅✅Relates recombination frequencies to actual physical distances
between genes
LOD scoring - ANS✅✅a statistical test often used for linkage analysis in human, animal, and plant
populations
genetic linkage - ANS✅✅tendency for alleles of genes on the same chromosome to be inherited
together
linkage analysis - ANS✅✅Gene mapping based on the detection of physical linkage between
genes, as measured by the rate of recombination, in progeny from a cross
haplotype - ANS✅✅A group of alleles of different genes on a single chromosome that are closely
enough linked to be inherited usually as a unit
single nucleotide polymorphism - ANS✅✅variation in a DNA sequence occurring when a single
nucleotide in a genome is altered
deletion mapping - ANS✅✅Technique for determining the chromosomal location of a gene by
studying the association of its phenotype or product with particular chromosome deletions
answers graded A+
linked genes - ANS✅✅Genes located on the same chromosome that tend to be inherited together
in genetic crosses.
non recombinant gamete - ANS✅✅Gametes that only contain original combination of alleles, no
crossing over
nonrecombinant progeny - ANS✅✅Possesses the original combinations of traits possessed by the
parents
recombinant progeny - ANS✅✅The progeny with new combinations of traits formed from
recombinant gametes.
recombinant frequency - ANS✅✅the proportion of offspring of a genetic cross that have
phenotypes different from the parental phenotypes due to crossing over between linked genes
during gamete formation
coupling - ANS✅✅Most prevalent gametes are those with two dominant alleles or those with two
recessive alleles. Favors homozygous
repulsion - ANS✅✅Gametes containing one dominant and one recessive allele will be must
abundant. Favors heterozygous
genetic map - ANS✅✅An ordered list of genetic loci (genes or other genetic markers) along a
chromosome.
physical map - ANS✅✅A genetic map in which the actual physical distances between genes or
other genetic markers are expressed, usually as the number of base pairs along the DNA.
map unit - ANS✅✅The distance on a chromosome within which recombination occurs 1 percent of
the time
, centimorgan - ANS✅✅map unit used to measure distance between genes on a chromosome; one
unit of this corresponds to a 1% chance of recombination occurring between two genes
two point test cross - ANS✅✅A test cross used to identify genetic linkage between two genes and
to determine the recombination frequency between the linked genes
three point test cross - ANS✅✅A test cross designed to identify genetic linkage between three
genes and to determine the recombination frequency between the linked genes
interference - ANS✅✅A measure of the independence of crossovers from each other, calculated
by subtracting the coefficient of coincidence from 1
coefficient of coincidence - ANS✅✅ratio of observed double crossovers to expected double
crossovers
mapping function - ANS✅✅Relates recombination frequencies to actual physical distances
between genes
LOD scoring - ANS✅✅a statistical test often used for linkage analysis in human, animal, and plant
populations
genetic linkage - ANS✅✅tendency for alleles of genes on the same chromosome to be inherited
together
linkage analysis - ANS✅✅Gene mapping based on the detection of physical linkage between
genes, as measured by the rate of recombination, in progeny from a cross
haplotype - ANS✅✅A group of alleles of different genes on a single chromosome that are closely
enough linked to be inherited usually as a unit
single nucleotide polymorphism - ANS✅✅variation in a DNA sequence occurring when a single
nucleotide in a genome is altered
deletion mapping - ANS✅✅Technique for determining the chromosomal location of a gene by
studying the association of its phenotype or product with particular chromosome deletions
