Problem Set: Mendelian Genetics ) In rabbits, erect ears (F) are dominant over f

Question

Problem Set: Mendelian Genetics) In rabbits, erect ears (F) are dominant over floppy ears (f). Black color results from an independently assorting allele (B) that is dominant over an allele for white (b) color. A white rabbit with erect ears is mated with a homozygous black rabbit with floppy ears. All F1 rabbits are black with erect ears. If two of the F1 rabbits mate, what phenotypes and proportions are expected in the F2 generation? You may use either a Punnett square or a branch diagram to show your work

Explanation / Answer

Answer:

Erect ear - FF,     floppy ear - ff,      Black- BB,    White- bb

Parent generation :                FFbb   x        ffBB

   Gametes             :                Fb                   fB

First generation (F1) :                FfBb

Phenotypic ratio : 9:3:3:1

9 (Erect ear and black) :3 (erect ear and white): 3 (floppy ear and black) : 1 (flopy ear and white)

   FB Fb fB fb FB     FFBB FFBb FfBB FfBb Fb     FFBb FFbb FfBb Ffbb fB     FfBB FfBb ffBB ffBb fb     FfBb Ffbb ffBb ffbb

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