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