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Dominant lethal trait

Dominant lethal trait

trait, expressed in the phenotype if present in the genotype, that precludes having descendants. All such cases are necessarily sporadic and must represent new mutations as the usual methods of classical genetics provide no means of demonstrating any genetic component whatsoever, except for tenuous arguments such as advanced paternal age. Molecular biology may help although the methods may be tedious; if there is an epistatic gene that may mask the trait, the logic is more tractable, though complex.


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The Implausible Engines of Evolution

... Also, keep in mind that most mutations are lethal, and thus they do not continue. The probability ... where it has been observed that mutations are dominant (my thing with evolution is that evolution ... (if it is a mutation). It is a harmful genetic trait. Imagine the possibility of a positive ...

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by Tomn
Fri Oct 07, 2011 9:27 pm
 
Forum: Evolution
Topic: The Implausible Engines of Evolution
Replies: 40
Views: 67292

The Implausible Engines of Evolution

... Mutations, as stated by the book, are mostly lethal. However, evolution is predicated upon the ... have the mistake in DNA. A mutation is not a trait that can be passed down, but it is a mistake ... (f), and the other unfavorable gene is dominant (F). If this is so, wouldn't the statistics ...

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by Tomn
Wed Oct 05, 2011 8:31 pm
 
Forum: Evolution
Topic: The Implausible Engines of Evolution
Replies: 40
Views: 67292

Sex-linked vs autosomal??

... X chromosome) (X^a,X^a) while the males have a dominant gene that allows them color (X^A,Y). All ... The other autosomal gene (C), has a lethal recessive allele. All parents were Cc for ... would have been had they not had the albino trait), and cc makes cream and kills (which is why ...

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by Eous
Wed Oct 13, 2010 4:26 pm
 
Forum: Genetics
Topic: Sex-linked vs autosomal??
Replies: 2
Views: 6147

Question(s) about Drosophila Melanogaster

Okay, I got the sex-linked trait (bar-eyes, X-linked dominant), as well as the lethal mutation (star-eyes) and all of the calculations and auxiliary ...

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by tempust
Thu Dec 17, 2009 1:35 am
 
Forum: Genetics
Topic: Question(s) about Drosophila Melanogaster
Replies: 1
Views: 2780

Question(s) about Drosophila Melanogaster

... that demonstrates epistasis. 2) Identify one lethal trait. 3) Identify an X-linked trait. 4) Identify three ... Here's some things I do know: Bar-eyes is an X-linked dominant trait. I just don't understand how to "arrive" ...

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by tempust
Thu Dec 17, 2009 12:00 am
 
Forum: Genetics
Topic: Question(s) about Drosophila Melanogaster
Replies: 1
Views: 2780
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