9. In Linumusitatissimum (flax, used to make linen textile), the blue color of the flowers (b)...
9. In Linumusitatissimum (flax, used to make linen textile), the
blue color of the flowers (b) and the long fiber length (l) are
recessive traits. A farmer mate true breeding plants with short
fibers and white flowers with plants with blue flowers and long
fibers.
a) What are the genotypes of these plants?
b) What is the geno type of the F1generation?
c) If plants from F1 are auto-fertilized and 800 F2 plants are
obtained,
1. calculate the expected number of plants with white flowers and
long fibers
2. determine the percentage of the different genotypes among these
(white flowers and long fibers).
Could you please give a detailed explannation on this exercise? Thank you!
Homework Answers
Blue coloured flowers = bb
White coloured flowers = BB, Bb
Long fibers = ll
Short fibers = LL, Ll
A.
True breeding plant with short fibers and white flowers = LLBB
True breeding plant with long fibers and blue flowers = llbb
B.
LLBB × llbb = F1 generation = LlBb (short fibers, white flowers)
C.
LlBb × LlBb = F2 generation
| Gametes | LB | Lb | lB | lb |
| LB | LLBB (short, white) | LLBb (short, white) | LlBB (short, white) | LlBb (short, white) |
| Lb | LLBb (short, white) | LLbb (short, blue) | LlBb (short, white) | Llbb (short, blue) |
| lB | LlBB (short, white) | LlBb (short, white) | llBB (long, white) | llBb (long, white) |
| lb | LlBb (short, white) | Llbb (short, blue) | llBb (long, white) | llbb (long, blue) |
Expected Phenotypic ratio = 9:3:3:1
9/16 = L_B_ (short, white)
3/16 = llB_ (long, white)
3/16 = L_bb (short, blue)
1/16 = llbb (long, blue)
Expected Genotypic ratio = 1:1:2:2:4:2:2:1:1
1/16 = LLBB
1/16 = LLbb
2/16 = LLBb
2/16 = LlBB
4/16 = LlBb
2/16 = Llbb
2/16 = llBb
1/16 = llBB
1/16 = llbb
1. Expected number of plants with white flowers and long fibers = (3/16) × 800 = 150
2. Proportion of genotype of white flowers and long fibers (llB_)
llBb = 2/16
Number of plants with llBb = (2/16) × 800 = 100
llBB = 1/16
Number of plants with llBB = (1/16) × 800 = 50
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