Genetics Exam test questions and answers
graded A+
1. Genetic
1:2:1 genotypic ratio
explana- tion
(ww:Ww:WW) 3:1 phenotypic ratio
of dominance
(round:wrinkled)
in the F1 and
3:1
segregation in
the F2
2. WW GG x ww gg Independent assortment gives rise to the 9:3:3:1 F2 generation
phenotype
ratio:
9=yellow, round
3=green, round
3=yellow, wrinkled
1=green, wrinkled
3. Independent alleles of two genes sort independently of each
as- sortment other (four kinds of gametes produced in equal
(Ww Gg) proportions==> 1/4 W, 1/4 w, 1/4 G, 1/4 g
1) Homologous chromosomes (2 pairs of sister chromatids)
4. the 2 division separate, creating 2 daughter cells with sister chromatids -- also
stages of called "reductional division"
meiosis 2) sister chromatids in both daughter cells from first stage
1/
52
, Genetics Exam test questions and answers
graded A+
separate and produce
four haploid daughter
cells
2/
52
, Genetics exam test questions and answers graded
A+
5. Alleles of linked Recombination occurs at the same frequency whether the alleles are
genes can be in in cis or trans
cis or trans In the trans configuration, the mutant alleles are on opposite
configura- tion chromosomes. Opposite true for cis configuration.
6. X-linked genes -If a gene is present on the x-chromosome, it is said to be "x-linked"
-This means that if a female were to pass an x-chromosome with a
recessive mutant allele to her son, he would show the mutant
phenotype. If she were to pass the x-linked recessive mutant allele
to her daughter, the daughter would most likely be a carrier
(because she has another x-chromosome with a wildtype dominant
allele).
-ex: white eyes on drosophila flies.
7. Stages of 1) Leptotene
Prophase I (in 2) *Zygotene*
Meiosis) 3) Early Pachytene
4) Late Pachytene
5) Diplotene
6) Diakinesis
3/
52
, Genetics exam test questions and answers graded
A+
4/
52
graded A+
1. Genetic
1:2:1 genotypic ratio
explana- tion
(ww:Ww:WW) 3:1 phenotypic ratio
of dominance
(round:wrinkled)
in the F1 and
3:1
segregation in
the F2
2. WW GG x ww gg Independent assortment gives rise to the 9:3:3:1 F2 generation
phenotype
ratio:
9=yellow, round
3=green, round
3=yellow, wrinkled
1=green, wrinkled
3. Independent alleles of two genes sort independently of each
as- sortment other (four kinds of gametes produced in equal
(Ww Gg) proportions==> 1/4 W, 1/4 w, 1/4 G, 1/4 g
1) Homologous chromosomes (2 pairs of sister chromatids)
4. the 2 division separate, creating 2 daughter cells with sister chromatids -- also
stages of called "reductional division"
meiosis 2) sister chromatids in both daughter cells from first stage
1/
52
, Genetics Exam test questions and answers
graded A+
separate and produce
four haploid daughter
cells
2/
52
, Genetics exam test questions and answers graded
A+
5. Alleles of linked Recombination occurs at the same frequency whether the alleles are
genes can be in in cis or trans
cis or trans In the trans configuration, the mutant alleles are on opposite
configura- tion chromosomes. Opposite true for cis configuration.
6. X-linked genes -If a gene is present on the x-chromosome, it is said to be "x-linked"
-This means that if a female were to pass an x-chromosome with a
recessive mutant allele to her son, he would show the mutant
phenotype. If she were to pass the x-linked recessive mutant allele
to her daughter, the daughter would most likely be a carrier
(because she has another x-chromosome with a wildtype dominant
allele).
-ex: white eyes on drosophila flies.
7. Stages of 1) Leptotene
Prophase I (in 2) *Zygotene*
Meiosis) 3) Early Pachytene
4) Late Pachytene
5) Diplotene
6) Diakinesis
3/
52
, Genetics exam test questions and answers graded
A+
4/
52
