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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.

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Q: Why would people have a trait of extra fingers in their generation?
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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.


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Are there pictures of people with six fingers and six toes?

Yes, some individuals are born with a condition known as polydactyly, where they have extra fingers or toes. There are pictures and documented cases of people with six fingers and six toes, although it is a rare occurrence.


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The recessive trait phenotype disappears in a one-trait test cross in the F1 generation. This phenotype can reappear in the F2 generation.


In mendels experiment a trait that always disappeared in the f1 generation but reappeared in the f2 generation was called the?

recessive trait


Trait that shows up generation after generation?

DOMINANT-K-


The trait that disappeared in the f1 generation?

reappears in some plants in the F2 generation


The trait observed in the first generation when parents that have different traits are bred?

A dominant trait.


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the dominant trait


Describe a genetic trait that is passed from one generation to another with out showing up in each generation?

Recessive trait carried by a hybrid or heterozygote.


Will there be a second generation for the nook?

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