In a hypothetical plant species, flower color is determined by the following bio
ID: 205685 • Letter: I
Question
In a hypothetical plant species, flower color is determined by the following biochemical pathway: Colorless- Yellow-_Orange- Red Purple Genes A, B, C, D and I are independently assorting. The dominant alleles, A, B, C, and D, encode active enzymes that catalyze the corresponding reactions, and the recessive alleles, a, b, c, and are nonfunctional. The dominant I allele totally inhibits the action of gene C, while has no effect. a. A cross is made between AbbCCDDII and AARBCCDDi plants. What is the genotype and phenotype of the F plants? b. These F1 plants are self-crossed. What is the phenotypic ratio of the resultant F2 generation? c. What proportion of the offspring of an AaBBCCDdix AaBBCcDdli cross is expected to have colored flowers?Explanation / Answer
Answer:
A).
AAbbCCDDII (yellow) x AABBCCDDii (purple)
AbCDI ABCDi ------Gametes
AABbCCDDIi (Orange)-------F1
b).
AABbCCDDIi x AABbCCDDIi -----Selfcross
ABCDI
ABCDi
AbCDI
AbCDi
ABCDI
AABBCCDDII (orange)
AABBCCDDIi (orange)
AABbCCDDII (orange)
AABbCCDDIi (orange)
ABCDi
AABBCCDDIi (orange)
AABBCCDDii (purple)
AABbCCDDIi (orange)
AABbCCDDii (purple)
AbCDI
AABbCCDDII (orange)
AABbCCDDIi (orange)
AAbbCCDDII (yellow)
AAbbCCDDIi (yellow)
AbCDi
AABbCCDDIi (orange)
AABbCCDDii (purple)
AAbbCCDDIi (yellow)
AAbbCCDDii (yellow)
Orange = 9/16
Purple = 3/16
Yellow = 4/16
c).
AaBBCCDdIi x AaBBCcDdIi
Aa x Aa = A_ (3/4) & aa (1/4)
If one or both the “A” alleles are available, the phenotypes are colorled.
So the probability of colored = 3/4
ABCDI
ABCDi
AbCDI
AbCDi
ABCDI
AABBCCDDII (orange)
AABBCCDDIi (orange)
AABbCCDDII (orange)
AABbCCDDIi (orange)
ABCDi
AABBCCDDIi (orange)
AABBCCDDii (purple)
AABbCCDDIi (orange)
AABbCCDDii (purple)
AbCDI
AABbCCDDII (orange)
AABbCCDDIi (orange)
AAbbCCDDII (yellow)
AAbbCCDDIi (yellow)
AbCDi
AABbCCDDIi (orange)
AABbCCDDii (purple)
AAbbCCDDIi (yellow)
AAbbCCDDii (yellow)
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