If Individual 3 has children with a woman that is heterozygous for the genetic disorder, what is the probability they will have an affected child?

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uchamplin · Accepted Answer

Well lets draw a punnet square. So first make your four boxes. Now, heterozygous means having two different alleles of a particular gene. Were going to use the letter A, but you can use any letter. In your first box there will be the dominant alleles. This can be identified as AA. A dominant allele is capitalized (A). A recessive allele is lower case (a). So in the first box it will be AA. Move over to the box on the right it will be Aa. Move down one box (on the right side) that will be aa. Now still on the bottom box, move over one to the left. That will be Aa. Since hetero means different, the heterozygous alleles would be Aa which means you have 2/4 probability of the child being affected. So 1/2.

ksporer · Answer

If Individual 3 has children with a woman who is heterozygous for the genetic disorder, then the chance of producing genetically disordered offspring is 25% if the male is heterozygous and 0% if the male is not.

What is the genetic disorder?

A recessive genetic disorder, such as cystic fibrosis, and an autosomal dominant disorder, such as Huntington's disease, are examples of genetic disorders caused by a gene that can express itself in either a dominant or recessive manner. For example, the disease is represented by the aa. If the male is heterozygous for diseases such as "Aa," then he will produce 25% "aa" type offspring when he crosses with the heterozygous female. When a man is purebred AA and crosses with a heterozygous female, then no offspring will be genetically infected.

Hence, if Individual 3 has children with a woman who is heterozygous for the genetic disorder, then the chance of producing genetically disordered offspring is 25% if the male is heterozygous and 0% if the male is not.

Learn more about the genetic disorder here.

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If Individual 3 has children with a woman that is heterozygous for the genetic disorder, what is the probability they will have an affected child?

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