Two new mutant lines of a flowering plant have been obtained; one breeds true fo
ID: 47364 • Letter: T
Question
Two new mutant lines of a flowering plant have been obtained; one breeds true for blue flower color and the other breeds true for red flower color (wild-type flower color is purple). Consider the following crosses: a. blue purple F1 all purple F2 75% purple; 25% blue b. red purple F1 all purple F2 75% purple; 25% red c. red blue F1 all purple If the purple flower color results from the mixture of red and blue pigments, and all the intermediate products in the pigment pathways are colorless, what phenotypic ratios do you expect in the F2 of cross 3? Two new mutant lines of a flowering plant have been obtained; one breeds true for blue flower color and the other breeds true for red flower color (wild-type flower color is purple). Consider the following crosses: a. blue purple F1 all purple F2 75% purple; 25% blue b. red purple F1 all purple F2 75% purple; 25% red c. red blue F1 all purple If the purple flower color results from the mixture of red and blue pigments, and all the intermediate products in the pigment pathways are colorless, what phenotypic ratios do you expect in the F2 of cross 3?Explanation / Answer
In a cross between blue and red flowers, the obtained genotype is BR. The flowers with genotype BR are purple in colour which are the F1 individuals.
On crossing the F1 individuals i.e. BR * BR the individuals in F2 generation have the following genotypes.
BB, BR, BR,and RR.
Hence, from the above genotypes it can be concluded that 1 Blue flower, 2 purple flowers and 1 Red flower are obtained.
Therefore, the phenotypic and genotypic ratios of the F2 generation are 1:2:1.
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