Brown eyes are dominant to blue eyes. Assuming two heterozygous individuals are crossed together, what phenotype ratio would we expect from the offspring?
75% brown, 25% blue
75% blue, 25% brown
50% brown, 50% blue
100% brown
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When does non-disjunction of chromosomes occur regarding chromosome disorders?
Meiosis
Cell growth
The cell cycle
Mitosis
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In fruit flies, red eyes are dominant to white eyes. If a homozygous dominant fly is crossed with a homozygous recessive fly, what percentage of the offspring would have white eyes?
75%
50%
0%
25%
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What type of mutation causes down syndrome?
Non-disjunction in chromosome 21.
A point mutation in chromosome 21.
An extra Y chromosome.
Non-disjunction in chromosome 23.
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What happens during a silent mutation?
A stop codon is produced.
An amino acid is changed.
All amino acids are changed after that mutation.
No amino acids are changed.
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What type and how many cells are produced in meiosis?
two haploid cells
two diploid cells
Four haploid cells
four diploid cells
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A gene that is found on the X chromosome is a...
Recessive trait
Sex-linked gene
Dominant trait
Mendellian trait
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The point where RNA polymerase binds and transcription takes place is in which part of the lac operon?
CAP site
lacz,x,y
Promotor
Operator
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Which of the following are frameshift mutations?
insertions
deletions
Substitutions and deletions
Deletions and insertions
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How many cells and what type are produced in Meiosis phase I?
Two genetically identical diploid cells.
Two genetically different diploid cells.
Two genetically different haploid cells.
Two genetically identical haploid cells.
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What ratio of the offspring will be carriers given a homozygous dominant and a heterozygous parent?
1/2
1/4
1/3
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What are the symptoms of the inherited disorder, hemophilia?
Abnormal redblood cell shape.
Inability to distinguish between red and green.
Stunted/slowed limb growth.
Blood that is unable to clot after injury.
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Which structure is required for the lac operon?
CAP site
All of these.
Operator
Promotor
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In which phases do the spindle fibers form during meiosis?
Metaphase I and II
Prophase I and II
Proshpase I
Metaphase II
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Four' o' clock flowers come in three colours: Red, white (homozygous) and pink (heterozygous). What type of inheritance is this?
