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Understanding Genetic Pedigrees: Mapping Genotypes and Sex Representation

This guide explains how to understand and construct a genetic pedigree based on a simulation of parent-offspring relationships. It focuses on interpreting genotypes, including homozygous dominant, heterozygous, and homozygous recessive traits. Learn how to translate genetic data into sex representation (male and female) using the XY and XX genotype system. Discover how to record new genotypes after mating, illustrating the lineage of the offspring and their representation in pedigree charts. This guide is essential for studying genetics and understanding inherited traits.

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Understanding Genetic Pedigrees: Mapping Genotypes and Sex Representation

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  1. This is what your data screen looks like from the simulation with the exception of Offspring 2. Offspring 2 is the new genotype of the person with whom you mated. It is not recorded in your data screen but you can collect that data by looking at that person’s new genotype after mating. Parent 1 Parent 2 Offspring 1 Offspring 2 Offspring 1 becomes Parent 1 for next generation

  2. Translate the data for the first gene into the sex of the individual. For example, if you determined that 1 indicated heterozygous that means that 1 codes for a male since the male genotype is XY. Therefore, 2 indicates homozygous since female is XX. Parent 1 Parent 2 Offspring 1 Offspring 2 1 is M 2 is F

  3. Typically, male is represented by a square and female by a circle. Then, determine how to represent homozygous dominant, heterozygous and homozygous recessive. Parent 1 Parent 2 Offspring 1 Offspring 2 2 is homozygous dominant 1 is heterozygous Male Female 0 is homozygous recessive

  4. Take the following data and complete a pedigree using the previous example as an outline for how to proceed. Below is the data. Parent 1 Parent 2 Offspring 1 Offspring 2 Offspring 1 becomes Parent 1 for next generation

  5. Translate the data for the first gene into the sex of the individual. For example, if you determined that 1 indicated heterozygous that means that 1 codes for a male since the male genotype if XY. Therefore, 2 indicates homozygous since female is XX. Parent 1 Parent 2 Offspring 1 Offspring 2 1 is M 2 is F

  6. Typically, male is represented by a square and female by a circle. Now, complete a pedigree that represents the genotype of each individual. Parent 1 Parent 2 Offspring 1 Offspring 2 2 is homozygous dominant 1 is heterozygous Male Female 0 is homozygous recessive

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