Dictionary » R » Recessive

Recessive

Definition

adjective

(general) Going back; receding.

(genetics) Of, or pertaining to, a gene (or allele) whose phenotypic expression is masked by a dominant gene (or allele).

noun

(1) A recessive allele or trait.

(2) An organism whose recessive trait is discernible or expressed.


Supplement

In genetics, a recessive gene or allele is one in which the effect is not tangible, or is masked by the effects of the dominant gene. The recessive trait may be expressed when the recessive genes are in homozygous condition or when the dominant gene is not present. That happens when an organism inherits a pair of recessive genes from its parents.


Word origin: Latin recess(us), a withdrawal, receding part + -ive.

Related forms: recessiveness (noun), recessively (adverb).
Related terms:

Compare: dominant.


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genotype ratio and phenotype ratio in X linked allege

Ok I how would I write out the genotype and phenotype for a X link recessive gene when after the punnett square the two females are not effect and the two males are effected?

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by greenchicken
Wed Mar 18, 2015 8:57 pm
 
Forum: Genetics
Topic: genotype ratio and phenotype ratio in X linked allege
Replies: 0
Views: 59

Re: need help with some home work

... FACE of it, if you have a parent Aa cross with AA, you should get a baby with either AA or Aa right? However, it is possible to get a baby with recessive phenotype. The answer is yes for the third question too! This is how it works. uNDER special circumstances, a gene might be influenced by ...

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by Youngji
Sun Feb 01, 2015 1:14 pm
 
Forum: Genetics
Topic: need help with some home work
Replies: 2
Views: 916

Allelic exclusion

Why do B cells undergo allelic exclusion at all...why they dont show normal dominant-recessive pattern

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by jannat
Thu Jan 22, 2015 4:19 am
 
Forum: Genetics
Topic: Allelic exclusion
Replies: 0
Views: 317

need help with some home work

Well,I am sorry to say this-But your first two answers are wrong! 1)See,recessive alleles can be expressed only and only in the homozygous condition.So you need not say specifically 'homozygous' for a recessive allele THAT HAS BEEN EXPRESSED. For example: Lets ...

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by Athira
Fri Jan 16, 2015 7:33 am
 
Forum: Genetics
Topic: need help with some home work
Replies: 2
Views: 916

need help with some home work

1. can a man and a woman that are both homozygous for a recessive allele produce a heterozygote baby? I said yes here 2.Can A man and a woman that are both homozygous for a dominant allele produce a heterozygote baby? I said yes here 3. Can A dominant ...

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by scoe
Thu Jan 15, 2015 6:55 pm
 
Forum: Genetics
Topic: need help with some home work
Replies: 2
Views: 916
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