GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The law of dominance states that dominant traits are inherited separately while incompletely dominant traits are inherited together.
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The law of segregation states that each offspring inherits traits separately and that multiple traits will never be inherited from the same parent.
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The law of independent assortment states that the allele for each trait is inherited separately from one another so the offspring can express any combination of traits.
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The law of incomplete dominance states that when one gene is incompletely dominant it is always inherited by the offspring if the offspring inherits another completely dominant trait.
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Detailed explanation-1: -Coat color in a dog breed is determined by incomplete dominance where three colors are produced (Brown, tan and white), and the brown coat allele (B) has incomplete dominance over the white coat allele (b).
Detailed explanation-2: -Incomplete dominance occurs when neither trait is truly dominant over the other. This means that both traits can be expressed in the same regions, resulting a blending of two phenotypes. If a white and black dog produce a gray offspring, this is an example of incomplete dominance.
Detailed explanation-3: -Coat colour in Labrador dogs is controlled by two different genes. Each gene has a dominant and a recessive allele. The two genes are inherited independently but the effects of the alleles interact to produce three different coat colours.
Detailed explanation-4: -Remember that dominant alleles cover up recessive alleles. If there is one dominant allele present, the dog will appear black. The brown allele is recessive to the black allele. There must be two copies of the recessive brown allele present in order for the dog to appear brown.