Dictionary » P » Pleiotropy




The single gene controlling or influencing multiple (and possibly unrelated) phenotypic traits.


Mutation in this type of gene will simultaneously affect more than one trait. An example is phenylketonuria, a human disease caused by mutation(s) in a single gene that codes for the enzyme, phenylalanine hydroxylase. The disease is characterized by mental retardation and reduced hair and skin pigmentation.

Word origin: Greek pleio, meaning "many", and trepein, meaning "influencing".

Related forms: pleiotropic (adjective).

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Genetic Crosses

a) Because the frequency of recombination is zero (all offspring resemble the parental types), the genes must be completely linked. b) It is called pleiotropy. White flower and short corolla can produce only 1 gamete type since it is homozygous at both loci, and red flower and medium corolla can ...

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by aptitude
Thu Oct 20, 2011 1:24 am
Forum: Genetics
Topic: Genetic Crosses
Replies: 3
Views: 6291

Lots of questions of heredity

... 2.LOCUS 3.BACK CROSS 4.NO,Polygeny is a gene interaction in which a single characteristic may be controlled by more than one gene... the ans is PLEIOTROPY 6.YES 7.EPIGENETICS 8.HERIDITY i hope so... nt sure of it..... :D :) 10.S I HOPE SO :) :D :D ... 12.LINKED

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by silviya
Sun Dec 05, 2010 8:56 am
Forum: Genetics
Topic: Lots of questions of heredity
Replies: 9
Views: 14339

human age and biology

... organisms grow old and die, while some (e.g., hydra) are immortal? Is there an adaptive advantage to ageing? One theory is "antagontistic pleiotropy," proposed by George C. Williams (who recently died at the age of 84). :( This theory holds that the genes that cause ageing also provide ...

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by StevePush
Wed Oct 06, 2010 2:36 pm
Forum: Evolution
Topic: human age and biology
Replies: 17
Views: 12642

Biology HW help

... wrote this answer. Save Answer 15. Week 7 Q.15 (Points: 5) The ability of a single gene to have multiple phenotypic effects 1. all of the above 2. pleiotropy 3. epistasis 4. incomplete dominance 5. multiple alleles (X) Save Answer 16. Week 7 Q.16 (Points: 5) The ABO blood group system is an example ...

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by sharingan23
Fri Feb 26, 2010 9:09 am
Forum: Genetics
Topic: Biology HW help
Replies: 1
Views: 15149

Re: Flagellum Motor:Is this Scientific?

... D. However, these mutations frequently eliminate or reduce pre-existing cellular systems and functions. This has been referred to as antagonistic pleiotropy; meaning the cell experiences a trade-off where a temporary benefit for surviving one environmental condition is provided at the expense ...

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by AFJ
Sun Jun 28, 2009 6:17 am
Forum: Evolution
Topic: Flagellum Motor:Is this Scientific?
Replies: 15
Views: 18673
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