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Hypothetically, brown color B in naked mole rats is dominant to white color b. Suppose you ran across a brown, male, naked mole rat in class and decided to find out if he was BB or Bb by using a testcross.

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Many physical traits like hair color and texture, eye color, and skin color are determined by the genotypes that parents pass down to their children. In a narrower sense, however, it can refer to different alleles, or variant forms of a gene, for particular traits, or characteristics. There is a complex connection between the genotype and the phenotype.

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Since the phenotype is the result of an interaction between genes and the environment, different environments can lead to different traits in individuals with a particular genotype. In addition, different genotypes can lead to the same phenotype.

This happens because genes have different alleles. For some genes and traits, certain alleles are dominant while others are recessive. Some aspects of eye color work this way. Brown eyes, for instance, are dominant over blue eyes. This is because a pigment called melanin produces the brown color, while having no pigment le to blue eyes.

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Having just one allele for the dark pigment is enough to make your eyes brown. There actually are several different pigments that affect eye color, each pigment resulting from a particular gene.

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This is the reason why people can have green eyes, hazel eyes, or any of a range of eye colors apart from blue or brown. When discussing genotype, biologists use uppercase letters to stand for dominant alleles and lowercase letters to stand for recessive alleles.

An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb. Finally, the genotype of an organism with two recessive alleles is called homozygous recessive.

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In the eye color example, this genotype is written bb. Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes.

The heterozygous genotype and the homozygous dominant genotype both will produce brown eyes, though only the heterozygous genotype can pass on the gene for blue eyes. The homozygous dominant, homozygous recessive, and heterozygous genotypes only for some genes and some traits.

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Most traits actually are more complex, because many genes have more than two alleles, and many alleles interact in complex ways. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another that contains the media credit. The Rights Holder for media is the person or group credited.

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Bb (heterozygous male) x bb (testcross female)

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Text on this is printable and can be used according to our Terms of Service. Any interactives on this can only be played while you are visiting our website. You cannot download interactives. But the first formal genetic study was undertaken by a monk named Gregor Mendel in the middle of the 19th Century.

Mendel bred peas and noticed he could cross-pollinate them in certain ways to get green or yellow seeds. Today, the field of genetics is breaking new ground searching for new ways to treat disease or develop crops more resistant to insects or drought.

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Empower your students to learn about genetics with this collection of resources. Genetic variation is the presence of differences in sequences of genes between individual organisms of a species. It enables natural selection, one of the primary forces driving the evolution of life.

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Genes are units of hereditary information. A gene is a section of a long molecule called deoxyribonucleic acid DNA. our community of educators and receive the latest information on National Geographic's resources for you and your students. Image Female portrait Many physical traits like hair color and texture, eye color, and skin color are determined by the genotypes that parents pass down to their children.

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Encyclopedic Entry Vocabulary. Media Credits The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another that contains the media credit. Media If a media asset is downloadable, a download button appears in the corner of the media viewer. Text Text on this is printable and can be used according to our Terms of Service.

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Genetic Variation. Educational Resources in Your Inbox. Educational Resources in Your Inbox our community of educators and receive the latest information on National Geographic's resources for you and your students.