Genetics Chapter 5 Questions With Complete Solutions
1.
Genes that "travel" together from one generation to the next
more often than not exhibit _____________________
______________________. Correct Answers genetic linkage
17.
The pairwise map distances for four linked genes are as follows:
A-B = 22 m.u., B-C = 7 m.u., C-D = 9 m.u., B-D = 2 m.u., A-D
= 20 m.u., A-C = 29 m.u. What is the order of these four genes?
A)ABCD
B)ADBC
C)ABDC
D)BADC
E)CADB Correct Answers B
18.
The zipper-like connection between paired homologs in early
prophase is known as a:
A)spindle fiber.
B)synaptic junction.
C)synaptonemal complex.
D)chiasma.
E)none of the above Correct Answers C
19.
The measured distance between genes D and E in a two point
test cross is 50 map units. What does this mean in physical
terms?
A)D and E are on different pairs of chromosomes.
,B)D and E are linked and exactly 50 map units apart.
C)D and E are linked and at least 50 map units apart.
D)either a or b
E)either a or c Correct Answers E
20.
Dihybrid test crosses are made between each pairwise
combination of the three genes O, P and Q with the following
results: OoPpxoopp PpQqxppqq OoQqxooqq
OP 152 PQ 88 OQ 198
Op 348 Pq 415 Oq 289
oP 353 pQ 413 oQ 311
op 147 pq 84 oq 202
1000 1000 1000
You wish to use the Χ2 test to determine whether the O and P
genes are linked. Which set of data would you use?
A)the first cross
B)the second cross
C)the third cross
D)all three crosses
E)the first and second crosses Correct Answers A
23.
The R/r and S/s genes are linked and 10 map units apart. In the
cross Rs/rS × rs/rs what percentage of the progeny will be Rs/rs?
A)5%
B)10%
C)25%
D)40%
E)45% Correct Answers E
, A dihybrid test cross is made between genes H and I. Four
categories of offspring are produced: HI, Hi, hI, and hi. You
wish to use the Χ2 test to test the hypothesis that the H and I
genes are unlinked. How many degrees of freedom would there
be in this test?
A)1
B)2
C)3
D)4
E)0 Correct Answers C
A hypothesis that predicts no linkage between genes is called the
______________ hypothesis. Correct Answers null hypothesis
A probability test that measures "goodness of fit" between
observed and predicted results is a __________
________________ test Correct Answers chi square test
A tetrad that carries four kinds of haploid cells: two different
parental and two different recombinant class spores is referred to
as ________________________. Correct Answers tetratype
A tetrad that contains four recombinant class haploid cells is
known as a ____________________ ditype. Correct Answers
non-parental
Ascospores are haploid cells that can germinate, replicate by
mitosis, and survive as haploid individuals. Correct Answers T
Chiasmata are structures of cross over between sister chromatids
of homologous chromosomes. Correct Answers F
1.
Genes that "travel" together from one generation to the next
more often than not exhibit _____________________
______________________. Correct Answers genetic linkage
17.
The pairwise map distances for four linked genes are as follows:
A-B = 22 m.u., B-C = 7 m.u., C-D = 9 m.u., B-D = 2 m.u., A-D
= 20 m.u., A-C = 29 m.u. What is the order of these four genes?
A)ABCD
B)ADBC
C)ABDC
D)BADC
E)CADB Correct Answers B
18.
The zipper-like connection between paired homologs in early
prophase is known as a:
A)spindle fiber.
B)synaptic junction.
C)synaptonemal complex.
D)chiasma.
E)none of the above Correct Answers C
19.
The measured distance between genes D and E in a two point
test cross is 50 map units. What does this mean in physical
terms?
A)D and E are on different pairs of chromosomes.
,B)D and E are linked and exactly 50 map units apart.
C)D and E are linked and at least 50 map units apart.
D)either a or b
E)either a or c Correct Answers E
20.
Dihybrid test crosses are made between each pairwise
combination of the three genes O, P and Q with the following
results: OoPpxoopp PpQqxppqq OoQqxooqq
OP 152 PQ 88 OQ 198
Op 348 Pq 415 Oq 289
oP 353 pQ 413 oQ 311
op 147 pq 84 oq 202
1000 1000 1000
You wish to use the Χ2 test to determine whether the O and P
genes are linked. Which set of data would you use?
A)the first cross
B)the second cross
C)the third cross
D)all three crosses
E)the first and second crosses Correct Answers A
23.
The R/r and S/s genes are linked and 10 map units apart. In the
cross Rs/rS × rs/rs what percentage of the progeny will be Rs/rs?
A)5%
B)10%
C)25%
D)40%
E)45% Correct Answers E
, A dihybrid test cross is made between genes H and I. Four
categories of offspring are produced: HI, Hi, hI, and hi. You
wish to use the Χ2 test to test the hypothesis that the H and I
genes are unlinked. How many degrees of freedom would there
be in this test?
A)1
B)2
C)3
D)4
E)0 Correct Answers C
A hypothesis that predicts no linkage between genes is called the
______________ hypothesis. Correct Answers null hypothesis
A probability test that measures "goodness of fit" between
observed and predicted results is a __________
________________ test Correct Answers chi square test
A tetrad that carries four kinds of haploid cells: two different
parental and two different recombinant class spores is referred to
as ________________________. Correct Answers tetratype
A tetrad that contains four recombinant class haploid cells is
known as a ____________________ ditype. Correct Answers
non-parental
Ascospores are haploid cells that can germinate, replicate by
mitosis, and survive as haploid individuals. Correct Answers T
Chiasmata are structures of cross over between sister chromatids
of homologous chromosomes. Correct Answers F
