Honors Chapter 9

An organism that has two identical alleles is known as

• homozygous or hybrid.

• homozygous or true-breeding.

• heterozygous or hybrid.

• heterozygous or true-breeding.

A breed of flower is red or white. This pattern of inheritance is known as

• codominance.

• complete dominance.

• incomplete dominance.

• polygenic inheritance.

Under the pattern of complete dominance, an organism that is heterozygous will have the

• dominant phenotype.

• intermediate phenotype.

• recessive phenotype.

• recessive genotype.

An example of a polygenic trait is

• cow color (red, white, or roan).

• snapdragon flower color (red, pink, or white).

• earlobe attachment (free or attached).

• skin color.

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Linked genes are found on

• one chromosome.

• homologous chromosomes.

• sex chromosomes.

• only the Y chromosome.

The law of segregation states that

• a dominant allele can overpower a recessive allele.

• sex is determined by sex chromosomes.

• alleles separate during meiosis.

• alleles for different traits do not affect their inheritance.

Two parents who have AB blood have a child. What is the chance of that child having B blood?

• 0%

• 25%

• 50%

• 100%

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The different versions of a gene are called

• chromosomes.

• alleles.

• linked genes.

• homologs.

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An organism's phenotype depends on

• their parents' genotypes and phenotypes.

• how many chromosomes they have and their genotype.

• the environment and their genotype.

• the environment and the gametes they form.

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A parent has two copies of a gene. What is the chance of them passing on one copy to their offspring?

• 0%

• 25%

• 50%

• 100%

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