WorksheetsReview: Genetics
Total questions: 15
Worksheet time: 14mins
Genetically identical plants will produce either pink or blue flowers, depending on the type of soil in which they are planted. What is most likely the explanation for the differences in flower color?
the flower color gene is codominant
mutations alter the flower color gene
the flower color gene is sex-linked
environmental factors affect flower color
Having freckles is dominant over not having freckles. If two individuals heterozygous for freckles have a child, what is the probability the child will have freckles?
0%
25%
50%
75%
Identical twin girls are separated at birth and cared for by two different families. After twenty years, the twins have different heights and weights. What is most likely the cause of these differences?
one twin had a genetic condition that prevented her from growing tall
the DNA of one twin was different from the DNA of the other twin
each twin was provided a different diet and physical activities
the proteins made by one twin were different than the proteins made by the other twin
A test cross is used to determine the genotype of an unknown individual by crossing it with an individual who is?
heterozygous
homozygous recessive
homozygous dominant
codominant
Which best explains why males cannot be carriers of X-linked traits?
Males only have one X chromosome
Males have two copies of the X chromosome
Males can be heterozygous for a particular trait
Males do not have an X chromosome
For a trait is codominant for both red and white alleles for flower color, heterozygous offspring will have flowers with both red and white (speckled). What would the offspring look like if the trait showed incomplete dominance?
pink
red
white
none of the above
If you cross two individuals who are heterozygous for a trait, what percentage of the offspring will also be heterozygous?
0%
25%
50%
100%
If two parents, one with Type A blood and one with Type B blood, produce a child with type O blood, what must the genotypes of the parents be?
heterozygous Type A and heterozygous Type B
homozygous Type A
homozygous Type B
heterozygous Type A and homozygous type O
Some traits like hair color, eye color, and skin color produce a spectrum of phenotypes due to?
polygenic
codominance
incomplete dominance
sex-linked inheritance
A family tree showing the inheritance of a particular trait over generations is known as a?
phylogenetic tree
karyotype
pedigree
Punnett square
A profile of an individual's chromosomes (karyotype) shows that an individual has 3 copies of chromosome 21 also known as?
PKU
Down Syndrome
Huntington's Disease
Polydactyly
A profile of an individual's chromosomes (karyotype) shows that an individual has an X chromosome and a Y chromosome. This individual is a?
biological male
biological female
non-binary
genetic disorder
A woman who is a carrier for the sex-linked trait hemophilia has children with a man with hemophilia. What percentage of offspring would be expected to have hemophilia?
0%
25%
50%
75%
Genotype refers to the individual's ?
physical appearance
combination of alleles
physical traits
adaptations
Phenotype refers to the individual's ?
genetic makeup
combination of alleles
physical appearance
DNA sequences
