How do i determine genotypes using a pedigree?

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  • How do i determine genotypes using a pedigree?


Answer #1 | 23/12 2013 08:50
You have to use your brain and logical thinking skills. It depends on the pedigree, obviously. It's like asking "how do I do math problems?" For instance, if you see that a child has a trait that is not seen in either parent, then you know that the trait is recessive, and furthermore that both parents are heterozygous. From that you can deduce that each parent had to have at least one parent with at least one dominant at least one recessive allele. And so on, and so forth. Similarly, if you see a trait that appears in all males, but not all females, you can deduce that it is likely caused by an X-linked recessive allele.
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