Brown eyes are dominant to blue eyes. Assuming two heterozygous individuals are crossed together, what phenotype ratio would we expect from the offspring?
75% blue, 25% brown
50% brown, 50% blue
100% brown
75% brown, 25% blue
25
When does non-disjunction of chromosomes occur regarding chromosome disorders?
The cell cycle
Meiosis
Mitosis
Cell growth
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?
75%
25%
0%
50%
25
What type of mutation causes down syndrome?
An extra Y chromosome.
Non-disjunction in chromosome 21.
A point mutation in chromosome 21.
Non-disjunction in chromosome 23.
25
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.
25
What type and how many cells are produced in meiosis?
two diploid cells
Four haploid cells
two haploid cells
four diploid cells
25
A gene that is found on the X chromosome is a...
Dominant trait
Mendellian 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?
CAP site
Promotor
lacz,x,y
Operator
25
Which of the following are frameshift mutations?
Deletions and insertions
insertions
deletions
Substitutions and deletions
25
How many cells and what type are produced in Meiosis phase I?
Two genetically identical diploid cells.
Two genetically identical haploid cells.
Two genetically different haploid cells.
Two genetically different diploid cells.
25
What ratio of the offspring will be carriers given a homozygous dominant and a heterozygous parent?
1/3
1/4
1/2
25
What are the symptoms of the inherited disorder, hemophilia?
Abnormal redblood cell shape.
Stunted/slowed limb growth.
Inability to distinguish between red and green.
Blood that is unable to clot after injury.
25
Which structure is required for the lac operon?
Operator
CAP site
All of these.
Promotor
25
In which phases do the spindle fibers form during meiosis?
Metaphase II
Prophase I and II
Metaphase 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?
