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WorksheetsGenetics- S7L3
Total questions: 15
Worksheet time: 8mins
What is a probable reason that a trait skips a generation?
The trait is recessive.
The trait is dominant.
The trait has been amplified.
The trait is extinct.
Which question does the process of selective breeding help to resolve?
How can the most desired traits in offspring be achieved?
How can mutations that are passed onto offspring be avoided?
How can two organisms be prevented from producing offspring?
How can breeding be sped up to increase the number of offspring?
In squirrels, the gene for gray fur (G) is dominant over the gene for black fur (g). If 50% of a large litter of squirrels are gray, what was the most likely parental cross?
GO × GO
Gg × gg
gg × gg
GG × Gg
Each species has a specific identifying number of chromosomes. For example, a cat, Felis catus, has 38 chromosomes, while corn, Zea mays, has 20 chromosomes. Each chromosome carries
the same genes as all of the other chromosomes in the set.
specific genes that are unique to that chromosome.
an enzyme helicase that binds the chromosome when it breaks.
identical DNA and RNA that was received from the parents.
A human male will normally transmit the genes on his X chromosome to
all of his sons and daughters.
only his daughters.
some of his sons and daughters.
only his sons.
Which of the following best describes genes?
polymers of peptides used to make proteins
nucleotide sequences in DNA that code for traits
pieces of RNA that produce carbohydrates
collections of nucleic acids that generate energy
Two sisters are born from a father who has blue eyes and a mother who has brown eyes. One sister has blue eyes, and the other has brown eyes. Which of the following explains this difference in eye color?
Each sister inherited a different combination of alleles from their parents that determined their eye color
One of the sisters inherited all of her alleles from the mother, and the other sister inherited only from the father.
The environment caused the alleles to be expressed in different ways, making the sisters' eye colors different.
The sister with the blue eyes had only one allele for determining eye color, and the sister with brown eyes had two.
Where is DNA mostly found within a cell?
in the ribosomes within the nucleus
in the cytoplasm within the cell wall
in the chromosomes within the nucleus
in the mitochondria within the cell wall
Which statement best describes the relationship between inherited traits and genes?
An individual's inherited traits are determined by genes, which are located inside a person's chromosomes.
An individual's inherited traits are based on a person's environment, and the traits change over time
Inherited traits are determined by a person's health and nutrition.
Inherited traits are determined only by a person's maternal parent.
The process of choosing a specific organism to breed based on producing desired traits is called
selective breeding.
natural selection.
natural breeding.
selective evolution
Which of the following best describes the difference between selective breeding and natural selection?
Selective breeding is the process of creating entirely new species, while natural selection modifies currently living species.
Selective breeding is performed by humans to achieve desired traits, while natural selection occurs without human involvement.
Selective breeding is performed by humans to change a trait in a currently living species, while natural selection is performed to change future offspring.
Selective breeding is a type of breeding that organisms in the wild carry out, while natural selection is a type of breeding that domestic organisms carry out.
In sexual reproduction, a zygote is
the product of fertilization of an egg by sperm.
the gamete responsible for the sex of the offspring.
an egg that has not been successfully fertilized.
the final stage before the birth of an offspring.
Which of the following is an example of genetic engineering?
manipulating potato genes to improve nutritional value, growth and flavor
creating a new identical mouse from the single cell of another mouse
a trait that is not advantageous disappearing over multiple generations
breeding two fast racehorses to produce offspring that have superior skills
A red-colored female New Hampshire Red mated with a red-colored male New Hampshire Red and produced golden-colored offspring. Which statement best explains how the offspring could inherit a trait that is not shown in the phenotypes of either parent?
The golden-colored offspring inherited its color from the other offspring.
The golden-colored offspring did not inherit its color from its parents or other offspring.
Both parents carried a recessive gene for the golden color and passed it on to their offspring.
Both parents carried a dominant gene for the golden color and passed it on to their offspring.
The gene for a nervous temperament in chickens is dominant over the gene for a gentle temperament. If the farmer mates a male Golden Comet that is heterozygous for the nervous temperament gene with a female White Leghorn that is homozygous for the gentle temperament gene, what is the likelihood they would produce offspring that are gentle?
0%
25%
50%
100%
