m 36, does the ex- 9:3:3:1 ratio nfer the operation responsible for now a bioche

Question

m 36, does the ex- 9:3:3:1 ratio nfer the operation responsible for now a biochemi n you predict d see among the x41. The garden flower Salpiglossis sinuata (painted g tongue) comes in many different colors. Several crosses are made between true-breeding parental strains to produce Fi plants, which are in turn self fertilized to produce Fe progeny Parents red x blue lavender blue all lavender 149 lavender. 51 blue lavender x red all bronze red × yellow allred yellow× blue all lavender 183 lavender, 81 yellow. 59 blue F, phenotypes all red F, phenotypes 102 red, 33 blue 84 bronze, 43 red, 41 lavender 133 red, 58 yellow, 43 blue d one male) es in the animal d the other is of yellow You know different al- outi (A) or e A gene black (B) or d the albino (C> c; cc is : you don't ally presernt To deter- a. State a hypothesis explaining the inheritance of flower color in painted tongues. b. Assign genotypes to the parents, Fi progeny, and F2 progeny for all five crosses. c. In a cross between true-breeding yellow and true- breeding lavender plants, all of the Fi progeny are bronze. If you used these Fi plants to produce an F2 generation, what phenotypes in what ratios would you expect? Are there any genotypes that might produce a phenotype that you cannot predict from earlier experiments, and if so, how might this alter the phenotypic ratios among the F2 progeny? lifferent petal phenotypes exist:

Explanation / Answer

i. From the given data, it appears that the flower color is determined by a monogenic trait with 3 alleles.
Red = RR or RB
Lavender = LL or LB
Bronze = RL
Blue = BB
R and L are codominant to each other. B is recessive to both R and L.

In crosses with the yellow gene, there is a 9:3:4 ratio in the progeny. This shows that yellow gene exhibits recessive epistasis with color gene i.e. yy genotype will mask the effect of RBL alleles.

ii.
a. RR X BB ---> RB
RB X RB ----> RR RB RB BB

b. LL X BB ---> LB
LB X LB ---> LL LB LB BB

c. LL X RR ---> LR
LR X LR ---> LL LR LR RR

d. RRYY X BByy ----> RBYy
RBYy X RBYy -----> red (R_Y_), blue (BBY_), and yellow (--yy)

e. LLyy X BBYY ---> LBYy
LBYy X LBYy ---> Lavender (L_Y_), Blue (BBY_), and yellow (--yy)

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