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 Polygenic Inheritance 40 Flashcards |
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Polygenic inheritance refers to the interaction of ___ genes contributing to a single trait. |
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Multiple |
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True or False: Polygenic inheritance involves the masking of gene expression at different loci. |
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False. Polygenic inheritance does not involve epistasis. |
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Continuous variation in traits is a characteristic of ___ inheritance. |
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Polygenic |
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What is an example of a trait that follows polygenic inheritance? |
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Height, skin color, and eye color are examples of traits that follow polygenic inheritance. |
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Fill in the blank: The inheritance of skin color is influenced by around ___ genetic loci. |
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60 |
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True or False: The ABO blood group system is an example of polygenic inheritance. |
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False. The ABO blood group system is controlled by multiple alleles at a single locus, not polygenic inheritance. |
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Define polygenic inheritance. |
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Polygenic inheritance is defined as quantitative inheritance, where multiple independent genes have an additive effect on a single quantitative trait. |
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Fill in the blank: In polygenic inheritance, each gene contributes a ___ effect to the final phenotype. |
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Small |
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What is the ratio of phenotypes in offspring from a cross involving two AaBbCc individuals? |
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The ratio of skin color phenotypes in offspring will follow a pattern of 1:6:15:20:15:6:1. |
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Polygenic inheritance is primarily responsible for the variation observed in traits such as ___ and ___. |
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Human height and skin pigmentation |
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True or False: The expression of polygenic traits is solely determined by genetic factors. |
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False. Environmental factors also significantly influence the expression of polygenic traits. |
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What does the term 'norm of reaction' refer to in the context of polygenic inheritance? |
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The range of possible phenotypes that can occur under various environmental conditions for a single genotype. |
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Fill in the blank: The color of a Hydrangea shrub's flowers is determined by the amount of ___ present in the soil. |
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Aluminum |
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In polygenic inheritance, how many genes approximately influence the color of human eyes? |
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At least 16 genes. |
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True or False: All traits governed by polygenic inheritance show discrete phenotypic categories. |
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False. Polygenic inheritance leads to continuous variation of phenotypes. |
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Polygenic inheritance involves multiple genes contributing to a single trait, such as ___ and ___. |
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Height and skin pigmentation |
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True or False: Polygenic inheritance is characterized by discrete categories of traits. |
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False; polygenic inheritance is characterized by continuous variation of traits. |
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Fill in the blank: Polygenic inheritance is also known as ___ inheritance. |
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Multiple gene |
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What is the main characteristic that distinguishes polygenic inheritance from single-gene inheritance? |
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Polygenic inheritance involves multiple genes.
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True or False: Epistasis is a key feature of polygenic inheritance. |
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False; polygenic inheritance does not involve epistasis. |
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