Question 2 of 21

How many chromosomes does each parent contribute to their offspring?

... Each parent contributes 23 chromosomes, for a total of 46 chromosomes per child.

Question 3 of 21

What did "Father of Genetics" Gregor Mendel use to help him test the principles of genetics during the 1860s?

... Mendel performed experiments with pea plants to learn about genetics.

Question 4 of 21

Which of the following eye colors is most dominant?

... Green eyes are dominant over blue, while brown eyes dominate both.

Question 5 of 21

Which of the following is NOT a valid reason why two blue-eyed parents could have a child with brown eyes?

... Environmental factors can impact DNA over time, but they can't change the sequence of genes that help determine eye color.

Question 6 of 21

How many different genes are involved in determining a child's eye color?

... By examining just six genes, scientists can predict an unborn child's eye color with an accuracy of 90 percent.

Question 7 of 21

What portion of the DNA map is identical for every human on the planet?

... All humans share 99.99 percent of the same DNA.

Question 8 of 21

Which of these traits does NOT follow a traditional dominant-recessive gene pattern?

... Blood type is not dominant-recessive. If a child has one parent with Type A blood and one with Type B, he will have Type AB blood.

Question 9 of 21

Which of the following terms describes a trait that is determined by multiple genes, rather than a single gene?

... Polygenic traits are the result of multiple genes.

Question 10 of 21

Are the majority of genetic diseases dominant or recessive?

... Most genetic disorders are recessive, which means both parents must carry the gene for the child to develop the disease.

Question 11 of 21

Which of the following is most useful for determining whether a male will suffer from premature baldness?

... The total number of bald persons in a family is the best predictor of whether a child will suffer from baldness.

Question 12 of 21

What percentage of your body mass index (BMI) can be attributed to genetics?

... About 75 percent of your BMI is thanks to genetics.

Question 13 of 21

How many genes does each human carry?

... Each human carries between 25,000 and 35,000 genes, which determine his features, traits and personality.

Question 14 of 21

Who discovered the famous “double helix” shape of DNA during the 1960s?

... Watson and Holmes won a Nobel Prize for their discovery of the double helix.

Question 15 of 21

What term is used to describe the environmental factors that may modify DNA over time?

... Epigenetic factors can include things like pollution, tobacco and sun damage.

Question 16 of 21

Thanks to the TAS2R38 gene, or lack thereof, 25 percent of the population lack this ability.

... The TAS2R38 gene determines one's ability to detect bitter flavors.

Question 17 of 21

What did Mendel name the features that eventually became genes?

... Mendel referred to factors when describing the basic of genetics.

Question 18 of 21

What term is used to describe two identical alleles, or versions of a gene?

... Homozygous refers to two identical alleles within a single individual.

Question 19 of 21

What term describes two different alleles, or versions of a gene?

... Two different alleles within an individual are referred to as heterozygous.

Question 20 of 21

Whether or not a person carries a particular gene is determined by this.

... Genotype describes all the genes that a person carries, whether or not they are expressed.

Question 21 of 21

The way genes are actually expressed in an individual is determined by this.

... A phenotype is one's actual features, and includes things like red hair, brown eyes and light skin.

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