Genetics Exam test queries and answers graded
A+
1. linked genes Genes located on the same chromosome that tend to be inherited
together in genetic crosses
located close together, travel together in meiosis, eventually arriving at same
destination
linkage is the opposite of Mendel's law of assortment
2. homologous prophase I - crossing over
re-
combination
in meiosis
3. Explain the genotypes
role of
homologous 5. how does test cross detect mei-
recombination
in ensuring
prop- er
segregation of
homologs in
meiosis I
4. Explain how (in
most
eukaryotes) a
single meiosis
generates cells
with four
unique
, Genetics Exam test queries and answers graded
A+
crossing over allows DNA to
mix and put the DNA in
ditterent orders without
changing the amount of
chromosomes, sizes, or
amount of DNA on a
chromosome
single meiosis creates four
unique genotypes due to
recombination and indepen-
dent assortment randomly
splitting up
by crossing with a pure
recessive, can see if there is
recombination by seeing if
the ratios of phenotypes
varies from phenotypes
with no recombination
, Genetics Exam test queries and answers graded
A+
otic recombina-
tion
6. using recombina- recombination frequency
tion frequencies
to order AB/ab x ab/ab
genes
( ( # Ab + # aB ) / total progeny ) * 100
=Rf smaller Rf, closer together on
chromosome
7. ability to map
genes limited recombination frequencies don't reflect
by directionality statistical inaccuracy at low
recombination frequencies areas of above and
below average recombination
8. duplication An aberration in chromosome structure due to fusion with a fragment
from a
homologous chromosome, such that a portion of a chromosome is
duplicated can give way to mutation
9. deletion deficiency in a chromosome resulting from the loss of a fragment
through break- age
usually lethal
A+
1. linked genes Genes located on the same chromosome that tend to be inherited
together in genetic crosses
located close together, travel together in meiosis, eventually arriving at same
destination
linkage is the opposite of Mendel's law of assortment
2. homologous prophase I - crossing over
re-
combination
in meiosis
3. Explain the genotypes
role of
homologous 5. how does test cross detect mei-
recombination
in ensuring
prop- er
segregation of
homologs in
meiosis I
4. Explain how (in
most
eukaryotes) a
single meiosis
generates cells
with four
unique
, Genetics Exam test queries and answers graded
A+
crossing over allows DNA to
mix and put the DNA in
ditterent orders without
changing the amount of
chromosomes, sizes, or
amount of DNA on a
chromosome
single meiosis creates four
unique genotypes due to
recombination and indepen-
dent assortment randomly
splitting up
by crossing with a pure
recessive, can see if there is
recombination by seeing if
the ratios of phenotypes
varies from phenotypes
with no recombination
, Genetics Exam test queries and answers graded
A+
otic recombina-
tion
6. using recombina- recombination frequency
tion frequencies
to order AB/ab x ab/ab
genes
( ( # Ab + # aB ) / total progeny ) * 100
=Rf smaller Rf, closer together on
chromosome
7. ability to map
genes limited recombination frequencies don't reflect
by directionality statistical inaccuracy at low
recombination frequencies areas of above and
below average recombination
8. duplication An aberration in chromosome structure due to fusion with a fragment
from a
homologous chromosome, such that a portion of a chromosome is
duplicated can give way to mutation
9. deletion deficiency in a chromosome resulting from the loss of a fragment
through break- age
usually lethal
