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Phenotypic ratio

Definition

noun

(genetics) Pattern of offspring distribution according to phenotype (i.e. observable characteristic)


Supplement

Phenotypic ratio pertains to the relative number of offspring manifesting a particular trait or combination of traits. It can be determined by doing a test cross and identifying the frequency of a trait or trait combinations that will be expressed based on the genotypes of the offspring.

For example: when a tall plant is crossed to a short plant, some of their offspring will be tall while others will be short. To determine the phenotypic ratio, the number of times the phenotypes (either tall or short) are expressed is counted. In this case, the phenotypic ratio shall indicate how many of the offspring will be tall and how many will be short based on the genotype.


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Mendel's Law

Having issues with determining the ratio. Describe the phenotypic and genotypic ratios for the F2 generation if pea plants with restricted yellow pods are crossed ...

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by curlzz07
Sat Oct 04, 2014 2:28 pm
 
Forum: Genetics
Topic: Mendel's Law
Replies: 0
Views: 22

Re: Brain size=IQ level theory (Blacks vs Whites & Asians)

... for human intelligence to correlate well with brain size, or with the ratio of brain mass to body mass. We can more-or-less see that in human evolution, ... "Negroid" archetype given their tremendous variability in phenotypic traits. So there is no "black brain size." You'd ...

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by Seth90210
Sat Oct 26, 2013 7:38 am
 
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 72
Views: 269831

I need help with Punnett Square

... Parents (Female: BW) x (Male: E) Offspring Phenotype Number Proportion Ratio Female: + 4982 0.4980 1.000 Male: + 5023 0.5020 1.008 Total 10005 then ... 10103 I did until here but, next questions are tough .... What was the phenotypic ratio for the offspring resulting from this testcross? Based ...

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by Yokie83
Sun Sep 29, 2013 9:21 pm
 
Forum: Genetics
Topic: I need help with Punnett Square
Replies: 1
Views: 3161

Bio Research Paper Writing

... proteome, epigenome, signalsome, etc and as a result there is a clear phenotypic destinction between healthy immune system function and abnormal ... in people not infected with CMV suggesting that changes in immune cell ratio may be the result of a viral disease rather than programmed inefficency ...

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by NathanielZhu
Thu Apr 04, 2013 2:25 am
 
Forum: General Discussion
Topic: Bio Research Paper Writing
Replies: 1
Views: 12640

I really need help with the Punnett square & genotypic

... be genotypically RR : Rr : rr - 1 : 2 : 1. It should be easy to make phenotypic ratio from that. F2 generation will be pretty hard, because one can combine all three of them ...

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by JackBean
Thu Jan 24, 2013 11:23 am
 
Forum: Genetics
Topic: I really need help with the Punnett square & genotypic
Replies: 4
Views: 4319
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