Which best describes Mendel’s law of dominance? (3B1)

When an organism has two different alleles of the same gene, one of the genes will be expressed and the other will be hidden

When an organism has two different alleles of the same gene, both genes will be expressed equally in the organism.

When an organism has two of the same alleles for a gene, that allele is always dominant

When an organism has two of the same alleles for a gene, the stronger of the two genes will be expressed in the organism

In pea plants, the allele for purple flowers is dominant to the allele for white flowers. Which of the following correctly describes a pea plant that has white flowers? (3B1)

It must be homozygous recessive

It could be either heterozygous or homozygous dominant

Which of the following are true about a recessive gene trait? Choose all that apply. (3B1)

It can be masked by a dominant gene trait

It is expressed only when a dominant gene isn’t present

It can be expressed when the genotype is homozygous

It is expressed when the genotype is heterozygous

It cannot be expressed but can only be passed onto the next generation

A homozygous dominant pea plant with purple flowers is crossed with a pea plant with white flowers. Which of the following correctly describes the offspring? (3B1) Work it out.

Heterozygous with purple flowers

Heterozygous with white flowers

If a professor crosses two heterozygous tall pea plants, what are the most probable genotypic outcomes that he will observe? Show your work. (3B2)

25% homozygous tall, 50% heterozygous, 25% homozygous short

75% heterozygous, 25% homozygous short

50% homozygous tall, 25% heterozygous, 25% homozygous short

Cystic fibrosis is a recessive genetic disorder that results from a defective gene on chromosome 7. For an individual to have symptoms of this disease, which of the following must be true? (3B2)

He or she must get a defective gene from both the mother and the father

He or she must get a defective gene from either the mother or the father but not from both

He or she must get a normal gene from the mother and a defective gene from the father

He or she must get a defective gene from the mother and a normal gene from the father

PKU is a recessive genetic disorder. If a person has one gene for PKU and one normal gene, which of the following will be true? Select all that apply. (3B2)

The person will be a carrier of the disease

The person will not have symptoms of the disease

The person will have full symptoms of the disease

The person will be unable to pass the disease on to offspring

The person will have some symptoms of the disease, but they will not be severe

A homozygous dominant individual will have what type of offspring? (3B1)

Offspring that will always exhibit the dominant trait

Offspring that will exhibit the dominant trait only if the other parent is also dominant

Offspring that will always exhibit the recessive trait

Offspring that will exhibit the recessive trait if the other parent has a recessive allele

When is a recessive allele for a trait expressed in the phenotype of an individual? (3B1)

When it is paired with another recessive allele

When it is paired with a dominant allele

When it occurs in a heterozygous individual

When it occurs in a homozygous dominant individual

Which is the best method to determine a dog’s phenotype? (3B1)

By looking at the dog’s parents

By mating the dog and examining its offspring

By examining the dog’s karyotype

In dogs, wire hair (S) is dominant and smooth hair (s) is recessive. If both parent dogs are heterozygous for this trait, what are the probable hair types of the resulting offspring? (3B2)

75% will have wire hair; 25% will have smooth hair

25% will have wire hair; 75% will have smooth hair

25% will have wire hair, 50% will have coarse hair, and 25% will have smooth hair

50% will have wire hair; 50% will have smooth hair

In pea plants, tall is dominant over short and purple flowers are dominant over white flowers. If a pea plant that is homozygous dominant for height and flower color is crossed with a short plant with white flowers, which traits are possible in their offspring? Select all that apply. (3B2)

Medium with light purple flowers

Chapter 8 Mendelian Genetics and Inheritance

Authored by Anne Wells

Biology

9th Grade

NGSS covered

Used 79+ times

Chapter 8 Mendelian Genetics and Inheritance

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39 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

different forms of the same gene

alleles

genetics

phenotype

genotype

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The study of heredity

alleles

dominant

genetics

zoology

having the same alleles for a trait

heterozygous

homozygous

allele

phenotype

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

piece of DNA that tells about a specific trait

chromosome

tetrad

codon

gene

the allele form that always expresses itself over another form

dominant

recessive

heterozygous

homozygous

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

physical characteristics of an organism

genotype

alleles

phenotype

homologues

having different alleles for a trait

homozygous

heterozygous

purebred

genotype

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Chapter 8 Mendelian Genetics and Inheritance

different forms of the same gene

The study of heredity

having the same alleles for a trait

piece of DNA that tells about a specific trait

the allele form that always expresses itself over another form

physical characteristics of an organism

having different alleles for a trait

the specific genes an organism has

Which best describes Mendel’s law of dominance? (3B1)

Which of the following represents a heterozygous genotype? (3B1)

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