![]() ![]() ![]() If the trait is dominant and the circle is clear, you know the genotype is recessive, aa. You must keep in mind that an individual gets one allele from their mom and one allele from their dad. Always start counting from left to right.Īfter figuring out those two parts, you can now figure out the genotypes of all the individuals. We identify generations using Roman numerals (I, II, III) and individuals using Arabic numerals (1, 2, 3). If the disorder is recessive, neither parent has to have the disorder because they can be heterozygous. If the disorder is dominant, one of the parents must have the trait. Next determine if the disorder is dominant or recessive. If it's autosomal the genotypes will be AA, Aa, or aa. If it is about a 50/50 ratio between males and females, then the disorder is autosomal. If it is sex-linked the genotypes will be XX and XY with an exponent on the X. If most of the males in the chart are affected (shaded in), then the disorder is sex-linked. First thing you need to do, is determine if the pedigree chart shows an autosomal or sex-linked trait ![]() Clear circles and clear squares will be normal, or not affected. If a circle is shaded in, then it represents an affected female. If the square is shaded in, then it represents an affected male. Males will always be squares and females will always be circles. ![]()
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