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Description of Mendelian Genetics

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1.Define dominance, recessiveness and sex-linkage.
2.What are the expected phenotypic ratios for a monohybrid cross, dihybrid cross, and sex-linked trait?
3. What is pedigree analysis? How can pedigree analysis be used to predict the phenotype of offspring?

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Solution Summary

Dominance is a condition wherein, a gene expresses itself by suppressing the expression of its counterpart. Recessiveness is a condition wherein, a gene is not expressed in the presence of the dominant gene. The inheritance of body characters or traits, which are controlled by genes present on the sex chromosomes is known as sex-linkage.

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1.Dominance: It is a condition wherein, a gene expresses itself by suppressing the expression of its counterpart. For instance, the gene for tallness is expressed by suppressing the gene for dwarfness. Thus, dominance is conventionally represented as 'T'. Recessiveness: It is a condition wherein, a gene is not expressed in the presence of the dominant gene. For instance, the gene for dwarfness is expressed only in the absence of the dominant gene. Thus, recessiveness is conventionally represented as 't'. Sex - linkage: The inheritance of body characters or traits, which are controlled by genes present on the sex chromosomes is known as sex-linkage. By convention, X-linked inheritance or X-linkage is commonly known as sex-linkage. It is the mode of inheritance of the characters ...

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