Genetics

What would be the phenotype ratio and genotype ratio in the offesprings in the f2 generation?

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2014-04-13 15:32:08
2014-04-13 15:32:08

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

phenotype ratio would be 3: 1

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Genotype ratio is the number of different genotypes that are present after a cross. Phenotype is defined as genetic make up. A 50 chance


If the parents were AA and AA for example then the phenotype ratio will be 1 A (the dominant allele). The genotype will be 1Aa.


Because in heterozygotes, both alleles are transcribed and translated.


Phenotype: 75% T 25% t Genotype: 25% pure dominant 25% pure recessive 50% heterozygous


the phenotype ratio is the physical appearance


A Sex Linked sperm Ratio. Not a dihybrid, tets cross, or a Probability.


The genotype is the actual code for a trait. Hidden on the chromosome we can never actually see the alleles controlling the trait unless we sequence the DNA. The phenotype is the result of at least two alleles expressing a visible or measurable trait in an individual. A genotype to phenotype ratio is the correspondence between the unseen code of the individual's alleles and the detectable quality of the individual's trait. This ratio relates the proportional quantities of unseen and seen, a comparison between the encoded trait and the expressed result of the code.


To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is homozygous recessive. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotype ratio is 3 dominant 1 recessive.


well, that would be Tt and Tt.... so... 1:2:1 is the ratio of the genotype. 3:1 is the ratio of the phenotype. do you go to MHS?


A punnett square shows the genotype of the offspring from which a phenotype can be determined if there is an understanding of how the alleles affect the appearance of the offspring. Least complicated would single alleles from each parent where parent AA is crossed with parent AA. In this case all offspring have the same phenotype so there is no ratio. Cossing Aa parents results in AA, Aa and aa offspring where based on phenotype AA and Aa are the same and aa is different. The ratio in this case would be 3:1 for phenotype.


There are a few purposes of the punnet square. One purpose for a punnet square is to track genetic traits. finding the phenotype ratio for a cross


A genotypic -ratio reflects the genetic configuration of an individual in the population. Several genotypes are possible in a phenotype and the ratio in which the genotypes segregate in a given phenotype is known as its genotypic ratio.


All of the F1 generation are heterozygous, therefore 100% exhibit the dominant phenotype. The F2 generation has a ratio of 1 homozygous dominant: 2 heterozygous: 1 homozygous recessive. This results in a phenotypic ratio of 3 dominant: 1 recessive.



its either shown by Punet chart its like a checker box on sides of which gametes are wirten and inside the boxes the result of cross have to wirte the final results should be mentioned in the ratio either of phenotype or the ratio of offsprings in their genotype


I don't know what trait is being measured here so I am going to pretend that it is height, where L is the tall allele and l is the short allele. You get: LL: 1/4 Ll: 1/2 ll: 1/4 This is the GENOTYPE ratio. Assuming L is dominant and l is recessive, the GENOTYPE ratio would be Tall: 3/4 Short: 1/4 You can confirm this by making a Punnet square


Simple calculations can be done using a punnet square if the genetics of the parents are known. If the offspring are being examined the phenotypic ratio can be calculated by observation. Genotype can be more problematic. Homozygous recessive traits will have an obvious phenotype with a matching genotype. Determining which offspring are heterozygous that are phenotypically dominant can be done by back crosses on homozygous recessive mates. If both the parents and the offspring can be examined...the observer may be able to determine parental genetics and therefore the potential genetics of the offspring more readily. The observer must keep in mind that any genotypic ratios will not be truly known without additional breeding trials.


Let's start at the beginning. A genotype is the allele combination for a specific trait. For example, the trait you inherit from your parents for tallness; the genotype may be Tt. The phenotype is the physical appearance. For example, long brown hair, blue eyes, etc. A phenotypic ratio is a ratio comparing the possible outcomes for an organism based on physical appearance. For example. you may complete a Punnett Square and your outcome is 3 purple : 1 white. This is your phenotypic ratio for flower color. (As an example) The genotypic ratio is the comparison of genetic information, the frequency. This can be expressed as 2:1:1 as an example of a ratio.


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


Mendel observed phenotypes for seven contrasting characters segregating in to three is to one ratio mathematically and thus he propounded the principle dominance and recessive characters


genotype of the parents - parents will be heterozygous dominant. e.g. take the example of Mendel's pea cross. if parent is heterozygous dominant then the genotype will be Tt and Tt now if you will do a cross then the result you will get is this - Tt X Tt result - TT, Tt, Tt, tt it gives a 3 : 1 ratio i.e. three tall and one dwarf. Source: "tumul v" yahoo.answers


It is the ratio of physical characteristics of parents and the potential offspring traits. It is the ratio of physical characteristics of parents and the potential offspring traits.


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


Mendel worked with sweet peas. Not all organisms have such straight forward genetics.


The mother will produce two types of gametes: IA and IO (mother is A) The father is AB his genotype is IAIB, thus he will produce these kind of gametes: IA and IB Four combinations are possible IA from Mother and IA from Father: The child has genotype IAIA and he has blood group A IO from Mother and IA from Father: The child has genotype IAIO and he has blood group A IA from Mother and IB from Father: The child has genotype IAIB and he has blood group AB IO from Mother and IB from Father: The child has genotype IBIO and he has blood group B Thus the phnotypic ratio is blood group A:B:AB = 2:1:1



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