MasteringGenetics: Homework 9: Wrap up of Topic 4 Problem Solving - Google Chrom

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MasteringGenetics: Homework 9: Wrap up of Topic 4 Problem Solving - Google Chrome e Secure https://session. masteringgenetics.com/myct/itemView?assignmentProblemID.5449736 Homework 9: Wrap up of Topic 4 Problem Solving Variations on Mendelian Inheritance & Pedigrees-summer 2017 > 10 of 10 The pedigree above shows segregation of an abnormal phenotype in a family. The dark shaded symbols indicate individuals that have exactily the same abnormal phenotype and the light/open symbols indicate individuals that appear normal. Refer to this figure as you consider the questions below. Part A If the dark-shaded symbols refer to a dominant phenotype, which of the following statements is ture? The dominant trait displays incomplete penetrance Course Tools The dominant trat displays variable expressivity The dominant triat displays complete penetrance. The dominant trait does not show variable expressivity. Answers (a) and (b) are both true. Answers (a) and (d) are both true. Answers (b) and (c) are both true. Aswers (c) and (d) are both true Desktop » ^ cp ENG 503 PM

Explanation / Answer

If the dark-shaded symbols refer to a dominant phenotype:
The dominant trait displays incomplete penetrance (as every affected person must have one affected parent for complete penetrance)
The dominant trait does not show variable expressivity (as every affected persion has the same intensity/degree of black shading)
Hence, Answers (a) and (d) are both true.

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