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Genetics

Answer key

1. Chromosomes are:

A. A structure of nucleic acids and proteins - answer

B. Alleles

C. Nucleic acids

D. DNA

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Answer Explanation: Chromosomes are a structure of nucleic acids and proteins

 

2. Phenotypes are the:

A. Chromosomes

B. The appearance of a trait - answer

C. A combination of alleles of a specific gene

D. Hydrolysis

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Answer Explanation: Phenotypes are the appearance of a trait.

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3. How many alleles of each gene do sexually reproducing organisms have?

A. Five

B. Twenty-three

C. Seven

D. Two - answer

 

Answer Explanation: Sexually reproducing organisms have two alleles of each gene. An organism can inherit two of the identical alleles or two different alleles this combination is called a genotype

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4.Describe the differences between heterozygous and homozygous

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Answer Explanation: Organisms with two identical alleles are called homozygous. Heterozygous is when an organism inherits two different alleles. Dominant alleles are more than recessive alleles so, a heterozygous will show the dominant trait.

 

 5. Explain incomplete dominance

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Answer Explanation: In a normal case the offspring would be red because red is the dominant trait but, incomplete dominance gives the offspring a mix of both the dominant and recessive traits.

  

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