In a hypothetical plant species, flower color is determined by the following bio
ID: 205447 • 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 d are nonfunctional. The dominant I allele totally inhibits the action of gene C, while has no effect. A cross is made between ddbbCCRRand ddBA(CRDi plants. What is the genotype and henotype of the Fi plants? a. b. These F plants are self-crossed. What is the phenotypic ratio of the resultant F2 generation? c. What proportion of the offspring of an daBACCRdli x daBRCRdli cross is expected to have colored flowers?Explanation / Answer
Answer:
The colorless trait is changed to yellow by dominant "A" allele.
The yellow color is changed to orange by dominant "B" allele.
The orange color is changed to red by dominant "C" allele in the absence of dominant allele "I"
The red color is changed to purple by dominant "D" allele.
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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