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The recessive traits in garden pea plants are as follows: yellow pods (g) are recessive to...

The recessive traits in garden pea plants are as follows: yellow pods (g) are recessive to green pods (G); bluish-green seedlings (s) are recessive to green seedlings (S); creeper (p) (a plant that cannot stand up) is recessive to normal (P). A homozygous plant with green pods, green seedlings and normal stature was crossed to a creeper with yellow pods and bluish-green seedlings. The F1 plants were then crossed to creepers with yellow pods and bluish-green seedlings. The following results were obtained:

2059 green pods, green seedlings, normal

151 green pods, green seedlings, creeper

281 green pods, bluish-green seedlings, normal

   15 green pods, bluish-green seedlings, creeper

2041 yellow pods, bluish-green seedlings, creeper

157 yellow pods, bluish-green seedlings, normal

282 yellow pods, green seedlings, creeper

      11 yellow pods, green seedlings, normal

A. Complete a Punnett square representing the test cross discussed above

B. Determine the expected genotypic and phenotypic ratio of the test-cross above.

C. Calculate the genetic distances among the three genes?

D. Construct the genetic map describing the map distances and the order of the genes.

E. Calculate the expected number of double cross-overs.

F. Calculate the coefficient of coincidence and provide an answer

G. Calculate the Interference. What does this number mean?

Solutions

Expert Solution

Ans)

B) expected genotypic and phenotypic ratio=1:1:1:1:1:1:1:1

C)order of genes=sgp or pgs

genetic distance Between s and g gene=12cM

Genetic distance between g and p=6.7cM

Distance between s and p=18.7cM

Ansd)

Anse)expected double cross over freq=0.12x0.067=0.00804

Ansf) C=0.65

Ansg) I=0.35

Interference is less so more cross over.

Solution:

gladiator answered 2 years ago
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