Saturday, June 19, 2010

In a certain cattle,hair color can be red (homozygous dominant), white (homozygous recessive) or ..?

roam ( mixture of red and white,heterozygous)



a) when red bull is mated to a white cow, what genotypes and phenotypes of offspring could be obtained?



b) If one of the offspring in (a) were mated to a white cow, what genotypes and phenotypes of offspring could be produced? In what proprtion?



In a certain cattle,hair color can be red (homozygous dominant), white (homozygous recessive) or ..?

A) Both the genotype and phenotype would be roan



B) 1/2 you would get roan(Rw)and 1/2 white(ww)



In a certain cattle,hair color can be red (homozygous dominant), white (homozygous recessive) or ..?

When a homozygous bull (RR) is mated with a white cow (rr) you would get 100% ROAN (notice spelling). Your genotype would be Rr for all of the calves produced. If you took one of your calves (Rr) and bred it to a white cow (rr) you would have a 50% chance of a roan (Rr) and a 50% chance for a white calf (rr).



In a certain cattle,hair color can be red (homozygous dominant), white (homozygous recessive) or ..?

A) all would be roam(Rr)



B) 1/2 roam(Rr) 1/2 white (rr)

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