Two genes of a flowering plant are on the same chromosomes; one controls height

Question

Two genes of a flowering plant are on the same chromosomes; one controls height and the other controls color.

Two genes of a flowering plant are on the same chromosome; one controls height and the other controls color. You cross a true-breeding tall plant with white flowers with a true-breeding short plant with purple flowers. The offspring are all tall plants with purple flowers. If the genes are separated by 20 map units, what is the expected frequency of short white-flowered plants in the F2 generation?

Explanation / Answer

Answer: 1%

Explanation:

TTpp(tall, white) x ttPP(short, purple)---------------Parents

TtPp (Tall, purple)

Distance between the genes = (%) Recombinants

TtPp x TtPp ----F1XF!

Gametes and their ratio.

Recombinant gametes

TP= 0.1

Parental gametes

tp =0.1

Tp = 0.4

tP = 0.4

Short, white flowered plant genotype is ttPP. During dihybrid cross, both recessive traits are produced in 1/16.

tp X tp = 0.1*0.1= 0.01= 1%

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