Single Factor Crosses: In one experiment, you crossed a pure bred peashooter wit

Question

Single Factor Crosses: In one experiment, you crossed a pure bred peashooter with a pure bred repeater (from plants vs zombies). All the F1 plants look like the pea shooter parent. Using the Punnet square, show the possible gametes formed during the cross. Determine the genotypic and phenotypic ratio. Which form of trait (pea shooter or repeater appearance) is recessive? Explain your conclusion (For the genes in the cross use G for peashooter appearance and g for repeater appearance). Test Cross: You are asked to determine if the fume-shroom (a fungi) that grew in your yard is a homozygous dominant or a heterozygous. The recessive trait/appearance of this fungi will look like a puff-shroom. The fume-shroom is crossed with a homozygous recessive puff-shroom. The resulting offspring: 2 looks the fume-shroom parent and the other 2 looks like the puff-shroom parent. What is the genotype of the fume-shroom parent (For the genes in the cross use F for fume-shroom appearance and f for puff-shroom appearance). Two-factor Crosses: In fungal species. Yellow pigment (B) are dominant over violet pigment (b), and tall (T) are dominant over short (t) in terms of height. A sun-shroom, a heterozygous for pigment and is short for height is crossed with a scaredy-shroom that is homozygous for pigment and heterozygous for height. What are the genotypic and phenotypic ratios for this cross? Will there be an offspring with a BbTt genotype and how many?

Explanation / Answer

1. Purebred peashooter allele is GG and pure bred repeater allele is gg

Parental phenotype            Purebred peashooter                 pure bred repeater

Parental gemotype                     GG                                            gg

gamates                               G          G                               g                g

                                                                  g                              g

F1 genotype are all Gg

F1 phenotype are all peashooter

Repeater trait is a recessive trait, because peashooter trait is dominating over the g trait, in F1 generation we get all the progeny is of peashooter trait and it represented by g.

2. The genotype for the fume shroom will be the heterozygous, Ff and the genotype of the puff-shroom will be ff, If you crossed in between heterozygous, Ff fume shroom and puff-shroom ff, then the resulting offspring will be 2 fume shroom and 2 will be puff-shroom.

                       parents genotype                     Ff             X       ff

                          gamates     F            f      X f                      f

                                                       F                                      f

                               fume shroom                                    puff-shroom

G Gg Gg G Gg Gg

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