Introduction to Genetics

Question 1

A scientist wants to examine a genetic disease in humans. The scientist hypothesizes that the disease can be treated by using gene therapy. Humans take a long time to reproduce and develop, so the scientist will have to

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test the hypothesis for a very long time.

Question 2

What alternate form of genes do nucleic acids have that allows them to offer variability?

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allele

Question 3

Which is the best example of a hypothesis leading to new experimental methods?

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Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.

Question 4

Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles. However, the child may have a sibling that does not have freckles. Which statement best describes the presence of freckles?

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There are two alleles for freckles.

Question 5

Why did Gregor Mendel use peas in his experiments?

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Peas have characteristics that have two forms.

Question 6

Which statement describes Mendel’s hypotheses regarding gametes?

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A gamete carries one allele for a gene.

Question 7

The table below summarizes Mendel’s results for the F2 generation.Mendel’s ResultsPlant height787 tall277 shortFlower color705 purple224 whitePod color428 green152 yellowPod shape882 inflated299 constrictedSeed color6,022 yellowx greenSeed shape5,474 smooth1,850 wrinkledWhat number should replace the letter x in the “Seed color” row?

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2,001

Question 8

Which statement best describes an understanding of genetics that would be missing without the work of Mendel?

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Some alleles are dominant, and some alleles are recessive.

Question 9

The table below summarizes the traits that Mendel examined during his experiments.Traits Studied by MendelWhat do these characteristics all have in common?

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They can all be easily observed.

Question 10

What is a gene?

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a section of DNA that codes for a specific trait

Introduction to Genetics Answers

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