When an organism is hybrid (heterozygous) for a pair of contrasting traits, only the dominant trait can be seen. Ex. Tt-Tall
In humans, traits such as the ability to roll your tongue, a widow's peak hairline and free earlobes are just a few examples of dominant traits.
Other organisms such as plants and animals also have dominant traits.
African Honey Bees Public Enemy Number 1
African honey bees are genetically dominant over European honey bees!
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