WorksheetsGenetics
Total questions: 22
Worksheet time: 17mins
Sex chromosomes are different in male and female. Which statement is correct?
Males are XX and Females are XY.
Males are ii and Females are XX.
Males are XY and Females are XX.
Males are XY and Females are ii.
Polygenic traits are controlled by more than 1 pair of genes. Give an example.
Freckles
Eye Color
Dimples
Widows Peak
What helps determine genotypes that are created from organisms mating?
A test cross
Mitosis
DNA replication
Somatic Cells
Which type of allele is masked or hidden in this example: Hh
The dominant one
The homozygous one
The heterozygous one
The recessive one
True or False: Recessive traits can skip generations and show up in a later cross.
True
False
Umm.. sometimes?
If you have an unaffected woman who is carrying a recessive sex-linked trait on her X chromosome, what is the likelihood she will pass that recessive trait on if she mates with a man who has that recessive trait?
0%
25%
50%
75%
To have a baby who has type O blood, what allele would each parent HAVE to be carrying?
Ia
Ib
Iab
i
Hemophilia is considered a sex-linked disorder. Why?
It only affects one sex.
It is recessive and carried on a sex chromosome: X.
It is recessive and carried on a sex chromosome: Y.
It impacts the sex of the baby that you'll have.
Why do sex-linked disorders carried on the X chromosome impact males more than females?
Because males only get one X and if it's affected, they automatically get the disorder.
Because males have a weaker immune system.
Because males have 2 X chromosomes.
Because males are more likely to get bad X chromosomes from their Dad.
Why do we use Punnett squares?
They show how many traits are passed on
They show the probability of passing one trait to offspring
They show how many offspring can be created.
They show disorders through many generations.
Monohybrid means...
the trait has one dominant and one recessive allele
the trait has many dominant and recessive alleles
the trait will always be homozygous
the trait is going to cause a disorder
If two parents show a dominant trait but their baby shows a recessive trait, what does this mean?
The baby cannot be theirs.
The baby has a mutation.
Both parents must've been heterozygous.
Both parents were homozygous dominant.
What is incomplete dominance?
when neither allele is dominant over the other so they both show up
when neither allele is dominant over the other so they blend or mix to make a new phenotype
when both alleles are dominant so they show up equally
when one allele is dominant over the other one
Incomplete Dominance: white flowers (Cw, Cw) and red flowers (Cr, Cr) make pink flowers (Cr,Cw). If a red and pink flower mated, what is the probability of having a pink flower?
25%
50%
75%
100%
How does crossing over in meiosis help with traits?
It adds diversity by giving new allele combinations
It adds mutations which allows for diversity.
It makes extra copies of chromosomes which makes more traits.
Crossing over doesn't occur in meiosis, it happens in mitosis.
Independent assortment is when genes separate to pass on different traits. This is seen when there are:
Identical twins sharing the same traits
Step-siblings
Fraternal twins who have different traits from different sperm/egg
Independent assortment doesn't really happen.
True or False: In crossing over when genes are shared and then the gamete is made, every cell that is created from that gamete will get all of that genetic information.
True
False
What would the parents genotype be in this Punnett square?
ii, IbIb
ii, IaIb
Iai, IbIb
Iai, IaIb
Blood types are an example of:
Simple dominance
Multiple allele inheritance
Incomplete dominance
A= Dimples
a= No dimples
What is true about both parents?
Both parents are homozygous and have dimples.
Both parents are homozygous and don't have dimples.
Both parents are heterozygous and don't have dimples.
Both parents are heterozygous and have dimples.
A= Dimples
a= No dimples
What is true about the offspring?
There are 3 different genotypes possible.
There are 3 different phenotypes possible.
50% will not have dimples.
25% will have dimples.
T= Widows Peak
t= Normal hair line
If a heterozygous female mated with a homozygous recessive male, what percentage of their offspring would have a widows peak?
25%
50%
75%
100%
