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Because male offspring receive only one copy of the X chromosome, the trait is expressed phenotypically in all men with the X-linked recessive allele.Female offspring can also express an X-linked recessive trait although only if they inherit two X-linked chromosomes (one from each parent) containing the recessive allele.They don't necessarily, I guess, have to be married. So it's going from that first generation to the second generation. So, this person, this person and that person, they are all brothers and sisters.
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A brief note: while we give you the phenotypic ratios in this review, it is probably not an efficient use of your time to memorize these ratios.
Autosomal recessive traits require two copies of the recessive allele to be expressed.
Autosomal Recessive Autosomal recessive pedigrees can look differently based on the genotype of the parents.
Here is an example pedigree: One trick for identifying a recessive trait is that if a trait skips a generation in a pedigree, it is often an autosomal recessive trait (although a trait can be autosomal recessive and not skip generations).