X linked inheritance1/2/2024 On or linked-to by the Website infringes your copyright, you should consider first contacting an attorney. Thus, if you are not sure content located Misrepresent that a product or activity is infringing your copyrights. Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially Your Infringement Notice may be forwarded to the party that made the content available or to third parties such Means of the most recent email address, if any, provided by such party to Varsity Tutors. Infringement Notice, it will make a good faith attempt to contact the party that made such content available by If Varsity Tutors takes action in response to Information described below to the designated agent listed below. Or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one The same percentages will be seen for the sons. 50% of daughters will have red eyes and 50% will have white. She also carries the recessive allele, meaning that she is heterozygous.įrom this cross, we are able to get the percentages reported in the question. Since one parent has white eyes and the other has red eyes, we know the mother must have red eyes. We know that they father must have white eyes. Since the father has only one X-chromosome, this chromosome must carry the white eye allele. This means that they must have inherited one recessive allele from each parent, while the sons must have inherited the recessive allele from the mother (they inherit the Y-chromosome from the father).Įach parent must have at least one recessive, white-eye allele. ![]() It is especially important to note that the daughters can express the recessive allele. Both sexes of offspring present the recessive allele. We know that red eyes are the dominant allele, which means white eyes are the recessive allele. Because one female is not affected, she must have inherited an unaffected autosomal allele from the heterozygous father.Īs such, the allele for the disease must be autosomal dominant. If the trait is on the X chromosome, it will be passed from the affected father to all female offspring, meaning that both females in the second generation would be affected. The female in the second generation is affected, even though her mother is not, meaning she must be heterozygous. The trait can affect females, so it cannot be on the Y chromosome. Knowing that the trait is dominant, we must determine if it is autosomal or sex-linked. We can also conclude that the affected father is heterozygous. They produce both affected and unaffected children in the second generation, meaning that the disease cannot be recessive if it were recessive, none of the second generation could be affected due to dominant alleles inherited from the mother. ![]() The first generation shows an affected father and an unaffected mother.
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