Question

In dogs, short hair is dominant over long hair, and dark coat color is dominant over albino fur. Assuming that these effects are caused by two independently sorting genes, what will be the result of the following cross? Create a Punnet square and show your work.

2. In tomatoes, the gene for round fruit is dominant to the gene for long fruit. A homozygous round fruit plant was crossed with a long fruit plant. Show the genotype of the two plants: RR Show the possible gametes: Rr Show the genotype of Fi: Rr fra Two of the F1 generations were crossed. Use a Punnet square to show the possible offspring. R RR RI : Prairri What is the phenotypic ratio of the offspring? What is the genotypic ratio of the offspring? 3:1 3. In dogs, short hair is dominant over long hair, and dark coat color is dominant over C albino fur. Assuming that these effects are caused by two independently-sorting genes, what will be the result of the following cross? Create a punnet square and show your work. A homozygous dark coat dog with long hair is mated with an albino, short-haired dog. Part I/Fundamental Biology

Answer 1

Notation used :

S = Short Hair

s = Long Hair

D = Dark Coat

d = Albino Coat

Genotype of Homozygous Dark coat with long hair = DDss

Genotype of Albino coat with short hair = ddSs   

(ddSS was also possible, but since this dog is not homozygous, hence we will use ddSs)

Gametes of Homozygous Dark coat with long hair = Ds , Ds , Ds , Ds

Gametes of Albino coat with short hair = dS , ds , dS , ds

So the resultant punnett square will be as follows :

Homozygous Dart coat with Long Hair = DD ss Albino Coat with Short Hair = dd Ss. Ds DdSS ds Ds DdSs Odds DdSS Odss es DdSS Dd so DdSs das es DdSs odas DdSs. Dess dS ds DdSs Ddss

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