Can two blue-eyed parents have a brown-eyed child? Take the quiz!

CORRECT ANSWERS: 0

While basic genetics education teaches us that parents carrying recessive traits like blue eyes should expect to produce blue-eyed children, modern science has proven that genetics in the real world is not quite so clear cut. Take our genetics quiz!

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Question 1 of 20

How many chromosomes does each parent contribute to their offspring?

46
28
23

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

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Question 2 of 20

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

orchids
apples
peas

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

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Question 3 of 20

Which of the following eye colors is most dominant?

blue
green
brown

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

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Question 4 of 20

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

environmental factors
gene mutations
gene recombination

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

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Question 5 of 20

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

six
three
two

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

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Question 6 of 20

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

about 50 percent
99.9 percent
none

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

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Question 7 of 20

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

skin color
blood type
hair color

... 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.

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Question 8 of 20

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

vestigial
polygenic
eugenic

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

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Question 9 of 20

Are the majority of genetic diseases dominant or recessive?

recessive
dominant
they can be either dominant or recessive

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

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Question 10 of 20

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

whether the mom's father is bald
whether the dad's father is bald
total number of bald persons in family

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

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Question 11 of 20

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

around 75 percent
around 95 percent
virtually none

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

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Question 12 of 20

How many genes does each human carry?

25,000 to 35,000
250,000 to 350,000
2,500,000 to 3,500,000

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

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Question 13 of 20

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

Watson and Holmes
Watson and Crick
Freud and Crick

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

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Question 14 of 20

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

recombinetic
polygenic
epigenetic

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

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Question 15 of 20

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

distinguish colors
depth perception
detect bitter flavors

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

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Question 16 of 20

What did Mendel name the features that eventually became genes?

queries
factors
pluses

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

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Question 17 of 20

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

homogenous
homozygous
homogenetic

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

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Question 18 of 20

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

heterozygous
vestigial
polygenic

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

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Question 19 of 20

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

zytotype
zenotype
genotype

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

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Question 20 of 20

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

phenotype
zytotype
genotype

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

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