Mendelian Genetics Exercise C: Predicting Results from a Monohybrid Cross The Pu
ID: 275089 • Letter: M
Question
Mendelian Genetics Exercise C: Predicting Results from a Monohybrid Cross The Punnett square protocol (con't) A cross of FF (purple-flowered peas) with ff (white-flowered peas) is shown 3. Pull the top alleles down into the boxes directly below them. as an example (Fig. 2) Combine those alleles with the alleles from the other parent (represented on the vertical axis) by pulling the vertical alleles to the boxes to their right (Fig. 2). Ff Note In the case of a heterozygote, always write the dominant allele (represented by a capital letter) in front of the recessive allele (represented by the lower case letter). Each internal box represents the probability (25%) expected of that genotype in the next generation. In the case in which more than one box is represented by the same genotype, the probability increases by 25% for each additional box Ff Fig. 2. Punnett square of FF x ff. 9. In the monohybrid cross of FF x f, what is the expected genotypic ratio. 10. In the monohybrid cross of FF xff, what is the expected phenotypic ratio. genotpes 11. Using a Punnett square as a model, construct a cross of Mendel's F, pea plants (using the from the F, generation as the parental alleles) and calculate the expected flower-related genotypes and phenotypes 12. What is the expected genotypic ratio of the F, generation? 13. What is the expected phenotypic ratio of the F, generation?Explanation / Answer
Ans9:
In the cross of FF×ff , genotypic ratio will be 0:1:0 (FF:Ff:ff) .
All will be genetically Ff .
Ans 10:
Phenotypic ratio will be
1:0 (dominant purple: recessive white phenotype ).
All will express dominant purple Phenotype.
Ans11:
Required cross will be between Ff&Ff
Ans 12:
Expected genotypic ratio
1:2:1
(FF:Ff:ff)
Ans13:
Expected phenotypic ratio
3:1
(3purple:1white).
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F f F FF Ff f Ff ff