Genetic Problem: Determining Genotype for Orange and White Feathers in Birds

[liana18us]

Genetic Problem.please Help!

Homework Statement

You know that the trait for orange feathers( RR or Rr) is dominant to white feathers(rr) in birds. you have an orange bird and you want to figure out the genotype.what type of crossing experiment would you use?predict the outcome of the cross if the bird has the genotype BB and if he is Bb.

Homework Equations

3. The Attempt at a Solution
wanted to find out if the right answer would be a punnett square and for the second part of the question,do i cross BB with RR and Bb with Rr?how will i predict the outcome of the cross?

 

[Nino MMP]

[/b]Yes, a Punnett Square would be the right answer to figure out the genotype. For the second part of the question, you could cross BB with Rr and Bb with Rr. Predicted outcomes would be 75% orange feathers (RR or Rr) and 25% white feathers (rr).

 

[Blueshift5]

[/b]

I would approach this genetic problem by conducting a test cross experiment. This involves crossing the orange bird with a bird known to be homozygous recessive for white feathers (rr). This will allow me to determine the genotype of the orange bird.

In the first scenario, if the orange bird has a genotype of BB, the outcome of the cross would be all orange offspring with a genotype of Bb. This is because the orange bird can only pass on the dominant allele (B) to its offspring, resulting in all heterozygous (Bb) offspring.

In the second scenario, if the orange bird has a genotype of Bb, the outcome of the cross would be a 1:1 ratio of orange and white offspring. This is because the orange bird can pass on either the dominant allele (B) or the recessive allele (b) to its offspring, resulting in both heterozygous (Bb) and homozygous recessive (rr) offspring.

To predict the outcome of the cross, I would use a Punnett square to show the possible genotypes of the offspring. For the first scenario, the Punnett square would show all Bb genotypes, and for the second scenario, the Punnett square would show a 1:1 ratio of Bb and rr genotypes.

In conclusion, by conducting a test cross and using a Punnett square, I can determine the genotype of the orange bird and predict the outcome of the cross based on its genotype.