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