Genetics Review

A plant with orange flowers was crossed with a plant with blue flowers. All of the offspring have orange flowers. Which of these terms describes the blue flower trait?

• Recessive
• Dominant
• Codominant
• Incomplete Dominance

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The punnett square shows a cross between two flowering plants. One parent has pink flowers (Pp) and the other parent has white flowers (pp). What percentage of pink flowers will you have? 

• 0
• 25
• 50
• 75

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Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?

• 0
• 25
• 50
• 75

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^{_{Scientists learned that the allele for long eyelashes (L) is dominant to the allele for short eyelashes (l), and the allele for strong eye muscles (M) is dominant to the allele for weak eye muscles (m). The Punnett square below show a cross between two of these organisms. What fraction of the offspring will most likely have long eyelashes with weak eye muscles?}} 

• 3/16
• 9/16
• 1/16
• 0/16

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The cross of a plant with white flowers (WW) and a plant with Green flowers (ww) is shown in the Punnett square below. What would be the genotype and phenotype of the offspring from this cross?

• Ww - white
• Ww - green
• WW - white
• ww - green

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What was one contribution Gregor Mendel made to science by performing his experiments on plants?

• Showing traits are inherited
• Proving that plants are living organisms
• Showing that the structure of DNA is a double helix
• Proving that random mutations cause the creation of new species

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The characteristic for curly hair (C) is dominant to the characteristic for straight hair (c).  A cross between two individuals for hair type is shown in the Punnett square below. What must the genotype of the parents be to produce the results shown in the Punnett square?

• Homozygous dominant X homozygous dominant
• Homozygous dominant X heterozygous
• Homozygous recessive X homozygous dominant
• Heterozygous X heterozygous

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A black cat mates with a white cat and their kittens all come out black and white speckled. This is an example of which of the following?

• Dominant
• Recessive
• Incomplete Dominance
• Codominance

The observed trait (physical appearance) that appears in an organism as a result of its genetic makeup is called the organism’s?

• Allele
• Gene
• Genotype
• Phenotype

If one parent is homozygous recessive for a butt chin and the other is heterozygous, what is the probability that their children will have a butt chin?

• 0
• 25
• 50
• 75

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