5.1PreTest/Post Test Mendelin Genetics

An individual has the phenotype Bb. Will they express the dominant or recessive trait?

• Recessive

• Dominant

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5.1- Mendelian Genetics

DOK 2

The form of a gene that is always expressed if present is the form.

​ ​ (a)  

• dominant
• recessive
• homologous
• heterogenous

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5.1- Mendelian Genetics

DOK 1

Which of Mendel’s laws BEST explains why an organism with a heterozygous genotype will show a dominant phenotype?

• Law of Dominance

• Law of Segregation

• Law of Independent Assortment

• Chromosome Theory of Inheritance

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5.1- Mendelian Genetics

DOK 1

Two parents have the genotype Gg for a genetic disorder caused by a recessive allele. What is the chance that any of their children will inherit the disorder?

• 25%

• 50%

• 75%

• 100%

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5.1- Mendelian Genetics

DOK 3

Which of Mendel’s laws states that organisms inherit two copies of each gene and donate one copy to each of their offspring?

​ ​ ​​ (a)  

• Law of segeration
• Law of Dominance
• Chromosome Theory of Inheritance
• ​ ​ Law of independent assortment

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5.1- Mendelian Genetics

DOK 1

In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat boar and a soft coat sow mate. They produce several litters, 50% are rough coat and 50% are smooth coat. What must be the genotypes of the parents to create this phenotypic ratio?

• Homozygous dominant and homozygous recessive

• Heterozygous and homozygous recessive

• C. Homozygous dominant and heterozygous

• Both heterozygous

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5.1- Mendelian Genetics

DOK 4

If two parents with dominant phenotypes produce an offspring with a recessive phenotype, then probably

​ (a)  

• both parents are heterogyzous
• one parent is homozygous recessive.
• only one parent is heterozygous.
• C. both parents are homozygous dominant.
• both parents are homozygous dominant.
• both parents are homozygous recessive.

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5.1- Mendelian Genetics

DOK 3

Given a dihybrid cross for a plant, where P (purple) is dominant to p (white) and S (spherical seeds) is dominant to s (dented seeds), what is the predicted phenotypic ratios if two plants are mated that are both heterozygous for both

traits?

• 1 purple, spherical: 1 purple, dented: 1 white, spherical: 1 white, dented

• 8 purple, spherical: 8 purple, dented: 0 white, spherical: 0 white, dented

• 9 purple, spherical: 3 purple, dented: 1 white, spherical: 3 white, dented

• 9 purple, spherical: 3 purple, dented: 3 white, spherical: 1 white, dented

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5.1- Mendelian Genetics

DOK 4

The American Curl is a breed of cat that has curly ears. The allele for the curly ears is dominant (E). Suppose a cat

with the heterozygous genotype is bred to a female cat with the homozygous recessive genotype. In your answer:

A. Draw a Punnett square that shows a cross between the two cats. (2 pts)

B. Write the phenotypic ratio of the offspring. (1 pt)

C. If the cross produces six kittens, how many of them will have curly ears? (1 pt)

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5.1- Mendelian Genetics

DOK 4

In humans, a widow’s peak is dominant to a straight hairline, and long eyelashes are dominant to short. A homozygous widow peak man, who is heterozygous for eyelashes, mates with a straight hairline, short eyelash woman.

Using H for hair and L for eyelashes,

list the genotypes of the parents and then complete a dihybrid cross for their potential offspring. List the phenotypic ratio of the offspring once you have completed the cross. (6 pts)

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5.1- Mendelian Genetics

DOK 4