Genetic Inheritance Quiz

What is the definition of an allele?

• The observable traits of an organism

• A cross between two different individuals

• A segment of DNA that codes for a specific protein

• The alternative forms of a gene at the same locus

Which of the following describes a homozygous organism?

• An organism with two different alleles for a gene

• An organism with two identical alleles for a gene

• An organism that can self-fertilize

• An organism with one dominant and one recessive allele

What is the purpose of a test cross?

• To determine the phenotype of an organism

• To analyze the effects of environmental factors on phenotype

• To identify the genotype of an organism with a dominant phenotype

• To observe the traits of offspring from a self cross

In genetics, what does the term 'phenotype' refer to?

• The genetic makeup of an individual

• The physical expression of a trait

• The location of a gene on a chromosome

• The alternative forms of a gene

Which of the following statements is true about dominant alleles?

• They can mask the expression of recessive alleles

• They are always represented by lowercase letters

• They do not affect the phenotype of an organism

• They are only expressed in homozygous conditions

If a plant has the genotype Pp, what is its phenotype for flower color?

• Cannot be determined

• Both purple and white flowers

• Purple flower

• White flower

What is a self cross?

• A cross that results in all offspring being heterozygous

• A cross between two homozygous individuals

• A cross between male and female parts of the same flower

• A cross between two different species

Which of the following best describes a locus?

• The observable traits of an organism

• The specific location of a gene on a chromosome

• The alternative forms of a gene

• The combination of alleles for a specific gene

What is the expected phenotypic ratio in the offspring of a self cross between two heterozygous plants (Pp)?

• 1:2:1

• 3:1

• 1:1

• 2:1

What does it mean for an organism to be heterozygous?

• It has two identical alleles for a gene

• It has two different alleles for a gene

• It has one dominant and one recessive allele

• It can only produce homozygous offspring