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Sex (X)-linked Dominant Inheritance Pedigree Example Answers (PDF) When completing this pedigree with X-linked dominant inheritance, use the symbols X and Y in the genotype to represent the sex chromosomes passed on from the previous generation.
By analyzing a pedigree, we can determine genotypes, identify phenotypes, and predict how a trait will be passed on in the future. The information from a pedigree makes it possible to determine how certain alleles are inherited: whether they are dominant, recessive, autosomal, or sex-linked.
When a gene is present on the X chromosome, but not on the Y chromosome, it is said to be X-linked. X-linked genes have different inheritance patterns than genes on non-sex chromosomes (autosomes). That's because these genes are present in different copy numbers in males and females.
- Hi Tanya, my understanding is that XX individuals with an SRY translocation (who develop as male-bodied) may need hormone supplementation at pubert...
- I'm not an expert on this, but my understanding is that SRY† is (usually) sufficient for embryonic testis formation and that the hormonal effects o...
- Sex linkage referes to a gene being linked to (or "on") a sex chromosome. Gene linkage refers to two genes that are on the same chromosome, and are...
- Any time you have dominant and recessive alleles of a gene it is only the dominant allele that gets expressed. There doesn't have to be a second al...
- In mammals, including humans, there is a pair of chromosomes that define the genotypic sex of that organism. These chromosomes are labeled X and Y...
- Yes, that is correct.
- Blood type is not a sex-linked trait. Its an autosomal trait determined by gene I located on chromosome 9. The gene I has 3 allelic forms, Ia, Ib a...
- well, depends on if disease is dominant or recesive and what the mother has
- Hemizygous is a term used to describe an individual who has only one member of a chromosome pair or chromosome segment rather than the usual two.
Aug 16, 2021 · Explanation of how an X-linked dominant trait behaves in a pedigree. Description of X-linked dominant inheritance and the rules you an follow when determining if a trait is inherited...
- 4 min
- 24.2K
- Nicole Lantz
Dec 13, 2021 · The diagram shows the inheritance of colorblindness in a family. Colorblindness is a recessive and X-linked trait (Xb) ( X b). The allele for normal vision is dominant and is represented by XB X B. In generation I, neither parent has the trait, but one of their children (II-3) is colorblind.
Examples of X-linked dominant inheritance include Rett syndrome and most cases of Alport syndrome. An example of a pedigree chart displaying an X-linked dominant condition. (X-linked dominant pedigree by Melissa Hardy is in the public domain).
The information from a pedigree makes it possible to determine how certain alleles are inherited: whether they are dominant, recessive, autosomal, or sex-linked. so, no they are not just used for autosomal dominant traits.
- 6 min
- Sal Khan
