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One reason is something called trisomy 31 which is a birth defect. Polydactyly is very uncommon but some families do pass it on as it is a dominate gene. But only about 500 cases are seen per year.
People of Asian and Caucasian decent are more likely to have radial (on the thumb side) polydactyly. Ulnar (on the little finger side) polydactylism is more common in people of African decent.
What else can I help you with?
Is having 6 fingers on one hand a dominant trait?
Yes having 6 fingers on your hand is a dominant trait. Most people who have this trait get the extra finger cut off after birth. There is a small group in the world where the people there have 6 fingers.
Are there pictures of people with six fingers and six toes?
Six Fingers and ToesYes there are pictures of people who have a 6th finger. My father and his brothers all had a 6th finger. They have all passed now but it is a family trait. I have photos with my father's hand showing his 6th finger. Two of my cousins have 6 fingers, and one of my cousins was born with extra fingers and toes. He had a total of 24 fingers and toes ++++++different person++++there are people with even seven on both hands and toes, such are show in the Guiness World Records.
In mendels experiment a trait that always disappeared in the f1 generation but reappeared in the f2 generation was called the?
recessive trait
What is the term for when a trait skips a generation?
The term for when a trait skips a generation is called "recessive inheritance."
The trait that disappeared in the f1 generation?
reappears in some plants in the F2 generation
Will the removal of the extra fingers meant that a child will not have polydactylous children?
The removal of extra fingers in a child with polydactyly does not guarantee that they will not have polydactylous children in the future. Polydactyly can be inherited genetically, meaning that even if a child has undergone surgery to remove extra fingers, they can still pass on the genetic trait to their offspring. The likelihood of having polydactylous children depends on the genetic factors inherited from both parents.
The observed trait in the first generation?
Dominant trait
If the F2 generation expressed a trait in a 3.1 ratio the F1 generation MUST be heterozyous for that trait?
True
When Mendel crossed the offspring generation with another was the trait for shortness lost?
When Mendel crossed the offspring generation, specifically the F1 generation (which displayed the dominant trait), with each other, the trait for shortness (the recessive trait) reappeared in the F2 generation. This occurred in a predictable ratio, typically 3:1, where three plants exhibited the dominant trait and one exhibited the recessive trait. Thus, the trait for shortness was not lost; it remained hidden in the F1 generation but became visible once again in the F2 generation.
The trait observed in the first generation when parents that have different traits are bred?
The trait observed in the first generation when parents with different traits are bred is known as the dominant trait. This trait is expressed in the offspring because it masks the expression of the recessive trait.
What is the phenotype in the F1 generation that disappears in a one trait test cross?
The recessive trait phenotype disappears in a one-trait test cross in the F1 generation. This phenotype can reappear in the F2 generation.
What is one genetic trait that masks another form of a trait?
Polydactyly is a genetic trait that can mask the presence of the recessive trait for normal digit number in humans. This means that individuals with polydactyly (extra fingers or toes) can carry the recessive allele for normal digit number without expressing it themselves.
