Bio 202 EXAM 3 QUESTIONS WITH COMPLETE
SOLUTIONS
? of single mRNA transcripts gives rise to multiple mRNAs.
Correct Answers Alternative splicing
- process used to regulate gene expression posttranscriptionally
2 hetero: co-dominance Correct Answers 1:2:1 pheno ratio
2 hetero: complete dominance Correct Answers 3:1 pheno ratio
2 hetero: incomplete dominance Correct Answers 1:2:1
phenotypic ratio
7 levels of gene regulation expression Correct Answers
Regulation of:
1. chromatin remodeling (chromatin to DNA)
2. transcription (to pre-mRNA)
3. splicing and processing (mRNA)
4.transport (nucleus to ribosome)
5. degradation of mRNA (cytoplasm)
6. translational regulation
7. protein modification (product)
A dihybrid test-cross was performed followed by a chi-square
analysis. The p value was less than 0.05. What does this mean?
It is likely that... Correct Answers The two genes are not
independently assorting.
A dihybrid was test-crossed.
, 400 progeny were counted.
How many would we expect in each phenotypic category?
Correct Answers 100:100:100:100
A gene will be ? in a cell because the cell doesn't have the
transcription factors to initiate transcription.
We can turn it ? in the cell if we link the coding region to a
promoter that drives expression in this type of cell Correct
Answers off, on
A sex-linked recessive allele produces a red-green color-
blindness in humans. A normal woman named Kate whose
father was color-blind marries a color blind man named
William. Of the girls produced from this couple, what
proportion can be expected to be colorblind? Correct Answers
1/2 of the girls
Autosomal Dominnt Correct Answers *MUST have affected
parent
1. does NOT skip generations
Autosomal Recessive Correct Answers *look for children with
unaffected parents
1. skips generations
2. males and females equally affected
3. rare
bombay phenotype Correct Answers lacks H antigen
Chromatin remodeling Correct Answers changes in DNA
structure that changes gene output
SOLUTIONS
? of single mRNA transcripts gives rise to multiple mRNAs.
Correct Answers Alternative splicing
- process used to regulate gene expression posttranscriptionally
2 hetero: co-dominance Correct Answers 1:2:1 pheno ratio
2 hetero: complete dominance Correct Answers 3:1 pheno ratio
2 hetero: incomplete dominance Correct Answers 1:2:1
phenotypic ratio
7 levels of gene regulation expression Correct Answers
Regulation of:
1. chromatin remodeling (chromatin to DNA)
2. transcription (to pre-mRNA)
3. splicing and processing (mRNA)
4.transport (nucleus to ribosome)
5. degradation of mRNA (cytoplasm)
6. translational regulation
7. protein modification (product)
A dihybrid test-cross was performed followed by a chi-square
analysis. The p value was less than 0.05. What does this mean?
It is likely that... Correct Answers The two genes are not
independently assorting.
A dihybrid was test-crossed.
, 400 progeny were counted.
How many would we expect in each phenotypic category?
Correct Answers 100:100:100:100
A gene will be ? in a cell because the cell doesn't have the
transcription factors to initiate transcription.
We can turn it ? in the cell if we link the coding region to a
promoter that drives expression in this type of cell Correct
Answers off, on
A sex-linked recessive allele produces a red-green color-
blindness in humans. A normal woman named Kate whose
father was color-blind marries a color blind man named
William. Of the girls produced from this couple, what
proportion can be expected to be colorblind? Correct Answers
1/2 of the girls
Autosomal Dominnt Correct Answers *MUST have affected
parent
1. does NOT skip generations
Autosomal Recessive Correct Answers *look for children with
unaffected parents
1. skips generations
2. males and females equally affected
3. rare
bombay phenotype Correct Answers lacks H antigen
Chromatin remodeling Correct Answers changes in DNA
structure that changes gene output
