In Genetica virginiana , fire breathing ( f ) is recessive to inability to breat

Question

In Genetica virginiana, fire breathing (f) is recessive to inability to breathe fire, green color (g) is recessive to yellow, and a unicorn-like horn (h) is recessive to no horns. The map of these three genes on autosome 3 is shown here. Ness is a trihybrid female, whose father was a true-breeding yellow, fire-breather with a horn. Ness is mated to Puff, who is a green fire-breather with a horn. f......5m.u.......g...............20m.u................h

Part A

What proportion of their offspring would be expected to be yellow fire-breathers with no horn?

Enter your answer as a percent, rounded to 1 decimal place. Don't include the percent sign, which is included in the answer box.

Explanation / Answer

Answer

The recombinant frequency between genes f and g is 5m.u

The recombinant frequency between genes g and h is 20m.u

Recomibanat frequency (f and g)/100 * Recombinant frequency (g and h)/100

= (5/100)*(20/100)

= 0.01

= 1 (approx)

Therefore, the expected proportion of the offspring to be yellow fire-breathers with no horns is 1.

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