Pedigree – Curly vs Straight Hair
Pedigree : a flowchart that uses symboles to show the inheritance patterns of traits in a family over many generations
In these diagrams, people are represented by symbols, usually circles for female and squares for male, and the bottom line represents the children of the couple above.
For simplicity, 4 offspring are shown in these examples. However, in practice the number, proportion and order of birth are likely to vary.
It is customary to use dark symbols to indicate someone affected with a genetic condition, and unfilled symbols for those who are unaffected. In the explanations that follow, an intermediate grey colour is used to assist in understanding the effect of a heterozygote carrier.
Genetic explanation
Curly hair is dominant and straight hair is recessive. The colored figures in the pedigree show which individuals have straight hair. Determine the genotypes and phenotypes for the pedigree in the diagram
Comments