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WorksheetsGenetics & Heredity Review
Total questions: 20
Worksheet time: 25mins
A trait is...
the sum of all biological processes by which particular characteristics are transmitted from parents to their offspring.
a characteristics that are passed on from a parent to a child.
when an organism has 2 of the same alleles for a particular trait.
when an organism has 2 different alleles for a particular trait.
An upper case letter is used to represent what allele?
Dominant
Recessive
Homozygous means...
two of the same alleles for a trait.
two different alleles for a trait.
one dominant allele and one recessive allele.
a blend of the two traits.
Which of the following would show the dominant allele in a completely dominant trait?
homozygous dominant
heterozygous
homozygous recessive
Sickle Cell Anemia is a genetic disorder that is controlled by a recessive allele. If a person suffering from Sickle Cell Anemia (ss) were to marry an individual who is heterozygous for the trait (Ss), what % of their children could be expected to be unaffected carriers (heterozygous) of the trait?
50%
0%
75%
100%
In hamsters, short hair (S) is dominant and long hair (s) is recessive. A hamster that is heterozygous for the trait is crossed with a hamster that has long hair. What should be the ratio of short haired hamsters to long haired hamsters among the offspring?
1:3
1:1
2:1
3:1
Red carnations are crossed with white carnations. All of the offspring are pink. Flower color in carnations is an example of what?
Codominance
Incomplete dominance
Recessive alleles
Complete dominance
Some cats have fur color as a codominant trait. If black fur (B) is dominant to white fur (W), what is the chance of getting white fur if you cross a heterozygous cat with a white cat?
0%
25%
50%
75%
A woman who is heterozygous for Type B blood has offspring with a male who is homozygous for Type A blood, what are the chances that the offspring will have Type B blood?
0%
25%
50%
75%
Multiple alleles is when...
the heterozygote is a blended phenotype.
the heterozygote is a combination of the two traits.
the trait is only found on the X chromosome.
traits are controlled by more than one type of allele.
Muscular dystrophy (Xd) is a recessive X-linked trait in humans. If a couple has a daughter with muscular dystrophy, what are the genotypes of the parents?
XDXd, XDY
XDXd, XdY
XdXd, XDY
XDXD, XdY
The failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, which resulting in an abnormal number of chromosomes is called...
Translocation
Gene therapy
Nondisjunction
Karyotype
A condition with an extra chromosome #21 is called...
Down Syndrome
Hemophilia
Colorblindness
Muscular dystrophy
A trisomy is...
a chromosomal condition characterised by an additional chromosome.
the state of having a single copy of a chromosome pair instead of the usual two copies
the condition of having a chromosome represented twice in a chromosomal complement.
a condition of having missing both chromosomal pairs.
What is the biological sex of the individual in the karyotype?
Male
Female
Has a gender disorder
Unable to tell
How many sex chromosomes are in a human karyotype?
2
44
23
46
Gametes are produced during...
Mitosis
Meiosis
Genetics
Nondisjunction
Metaphase II is which of the following images?
Gene therapy is...
characteristics that are passed on from a parent to a child.
the process where gametes are made in a cell division that reduces the number of chromosomes.
when a piece of one chromosome breaks off and attaches to a different chromosome.
the process of introducing normal genes into the cells of people with defective alleles.
Translocation is...
characteristics that are passed on from a parent to a child.
the process where gametes are made in a cell division that reduces the number of chromosomes.
when a piece of one chromosome breaks off and attaches to a different chromosome.
the process of introducing normal genes into the cells of people with defective alleles.
