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What is a monohybrid ratio?

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2011-02-07 15:03:32
2011-02-07 15:03:32

it is ratio of mono hybrid cross found in f2 generation .this ratio is 3:1

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Monohybrid Cross Phenotypic ratio: 3:1 Genotypic Ratio: 1:2:1




plants in case of MONOHYBRID ratio= 3:1 in case of DIHYBRID ratio = 9:3:3:1





you should have asked them to give you your explanation as well. Jerry


Because in heterozygotes, both alleles are transcribed and translated.


For monohybrid cross the genotype ratio in f2 generation would be 1:2:1 and phenotype ratio would be 3: 1



tHE 9:3:3:1 only applies to dihybrid cross: a monohybrid cross between two heterozygotes gives a 3:1 ratio



A monohybrid cross of two heterozygotes would be expected to produce the phenotypic ratio of 3:1 (3 dominant: 1 recessive).


It is 1:2:1 1 homozygous dominant 2 heterozygous dominants 1 homozygous recessive


The F1 dihybrid phenotypic ration is 1 to 3 to 3 to 1. The F1 monohybrid genotypic ration is 1 to 2 to 1.


A monohybrid cross is a breeding experiment between the P generation, or the parental generation, organisms that differ in one trait. A punnett square can be used to find the result of a monohybrid cross, but it can also be used to find the result of a dihybrid cross and so on. So, a punnett square is not the same as a monohybrid cross, but a method in which a monohybrid cross can be solved.


monohybrid cross is a type of cross done by mendelian in which only one trait of the parent is taken into consideration


F1 offspring obtained by monohybrid cross of AA and AA will be Aa.


representation of genotypes of a pair of contrasting traits of a character in the form of ratio is referred as genetic ratio. in this ratio the three different genotypes are represented- homozygous dominant genotype:heterozygote genotype:homozygous recessive genotype in case of a monohybrid cross ( either normal cross,reciprocal crosses of Mendel or back cross or test cross ratios) and for dihybrid crosses- dominant genotype:recombinant genotypes:recessive genotypes are represented. For instance monohybrid genotypic ratio is 1:2:1 and back cross/test cross ratio-1:1 For dihybrid genotypic ratio 1:2:2:4:1:2:1:2:1 It may differ in different cases according to T.H.Morgan.Bateson, punnet, Garrod etc.


The expected genotype ratio from a heterozygous x heterozygous cross is 1:2:1. For example, in the cross Bb x Bb the genotype ration would be 1BB:2Bb:1bb


A ratio that shows the different outcomes you can get from a genetic cross.A ratio that shows the varied outcomes that results from a genetic cross and is based on physical appearance alone. For example yellow flowers, round seeds, brown hair, green eyes etc.The genetic make up of an organism is called genotype and the external appearance or expression of the genetic make up is called phenotype (Color, height, shape etc.). The ratio indicates the number of heterozygotes and homozygotes with reference to the genotypic ratio and to the number of phenotypes expressed as phenotypic ratio. The concept was given by Sir Gregor Johann Mendel, Father of Genetics who worked on pea plant with reference to 7 different characters. The result obtained for a cross between a single character is called monohybrid cross and the ratio is referred to as monohybrid ratio which is 1:2:1 for genotypic ratio and 3:1 for phenotypic ratio.in the dihybrid cross for the phenotypic ratio it is 9:3:3:1.


The backcross between a heterozygous (monohybrid) red flower plant (Rr) and a homozygous recessive white flower plant (rr) would produce a ratio of 1Rr:1rr. So you would expect half of the offspring to be red (Rr) and half the offspring to be white (rr).


1:2:1 well, it is true,, yet i have a more details,,, if you have a monohybrid,,, Aa and that need to be crossed with a monohybrid,, Aa,,,while A allele is dominant over a allele ...so so the expected is offspring will be segregated into the following... AA,,,Aa,,AA ==> This is the phenotype of the trait that appear on the individuals 1 2 1 ==> this is the genetic ratio (because it describe the genetic composition of each individual and its ratio or number compared to the total population) __3__ 1 ==> this is the phenotypic ration (because it describe the overall phenotype of the individual what ever was his genetic composition is) Note that: AA ==> is a homozygous with a complete dominant phenotype Aa ==> is a heterozygous with dominant dose from the (A) allele AA ==> is a homozygous with the recessive complete phenotype of the (a) allele


A monohybrid cross is a cross between parents who are heterozygous at one locus; ... The results The wrinkled trait --- which had disappeared in his hybrid ...of them produced both types of seeds in the F3 and - once again - in a 3:1 ratio



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