8th Gr- Genetics Quiz

Which statement best describes Mendel's experiments?

• He began with hybrid plants

• He controlled pollination

• He observed only one generation

• He used plants that reproduce slowly

A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?

• 100% BB
• 75% BB and 25%Bb
• 50 % BB and 50% Bb
• 50% Bb and 50% bb

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Genotype refers to the ...

• physical expression of the genes
• the possible combination of alleles in a gene
• whether an allele is dominant or recessive
• how an organism will appear

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An offspring will receive how many alleles from each parent to determine a specific trait?

• one
• two
• three
• five

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Magda is a tall, 11 year old drummer. She has a scar on her right cheek. She is good at swimming. Which of her traits did Magda most likely inherit?

• height
• the scar
• ability to swim
• ability to play drums

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Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

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An allele whose trait only shows up when no dominant allele is present.

• hidden allele
• dominant allele
• recessive allele
• present allele

Snapdragon flowers come in red, pink and white.  What type of inheritance is this?

• Complete Dominance
• Incomplete Dominance
• Codominance
• Polygenic Inheritance

Incomplete dominance means that the traits are

• expressed equally
• dominant
• recessive
• blended

What is the probability of two heterozygous (Bb) parents having a homozygous recessive (bb) child?

• 0%

• 25%

• 50%

• 75%

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