This pedigree traces tongue rolling in a family.The ability to roll your tongue

1. (RR = homozygotic tongue-rollers, Rr = heterozygotic non-tongue-roller carriers, rr=homozygotic non-tongue-rollers)
I-1:      RR
I-2:      Rr
II-1,5:      Rr
II-2,3,4:   RR
II-6:      rr or Rr
III-1:      RR
III-2,3:   Rr
III-4,5:   Rr or rr

2.(YX=unaffected males, Yx=affected males, XX=unaffected homozygotic females, Xx=unaffected heterozygotic female carriers, xx=homozygotic affected females)

I-1:        Xx
I-2:        YX
II-1:       Yx
II-2:       XX
II-3:       Xx
II-4:       YX
III-1:      Yx
III-2:      Xx
III-3:      YX
III-4:      XX


3. (YX=unaffected males, Yx=affected males, XX=unaffected homozygotic females, Xx=unaffected heterozygotic female carriers, xx=homozygotic affected females)

I-1:        Xx
I-2:        YX
II-1:       YX
II-2:       Xx
II-3:       YX
II-4:       XX
III-1:      Yx
III-2:      XX
III-3:      Xx


4. FMF is a autosomal recessive disorder. We can infer this because parents of affected progeny can be unaffected. Also, it cannot be X-linked recessive because an affected daughter (IV-2) has an unaffected father (III-4)

(RR = unaffected homozygotic, Rr = unaffected heterozygotic carriers, rr=affected homozygotic)

I-1,2:      Rr
II-1,2:      Rr
II-3:      rr
II-4:      RR or Rr
III-1:      rr
III-2,3,4:   Rr
IV-1:      Rr
IV-2:      rr
IV-3:      RR or Rr

Hence, we are not sure about the genotypes of II-4 or IV-3. They can be either unaffected homozygotic dominant, or they can be unaffected heterozygotic carriers.


Hope the formatting is clear in this post.

Very helpful. Thank you.

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The ability to roll one's tongue has long been a subject of fascination in the realm of genetics. While seemingly a simple and inconspicuous trait, the skill of rolling the tongue is governed by a combination of genetic factors that intertwine in a family's genetic tapestry. This pedigree explores the inheritance pattern of tongue rolling within a family, shedding light on the fascinating interplay of genes.

The study of tongue rolling in a family's pedigree provides a captivating glimpse into the intricate world of genetics. While seemingly straightforward, the ability to roll one's tongue is a nuanced trait influenced by the interplay of dominant and recessive alleles. As we delve deeper into the genetic code that shapes our physical characteristics, the tongue rolling pedigree serves as a microcosm, illustrating the complexity and diversity inherent in the inheritance of traits within a family.

Thank you.