Which of the Punnett squares below shows a 100% probability that the cattle offspring will be homozygous dominant for red hair?(1 point)

Question

Responses
Parent 1= r,r
Parent 2=rr

parent1=R,r
Parent 2 = r,r

Parent 1, R,r
Parent2=R,R

Parent1=R,R
Parent2=R,R

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Answer 1

To determine which of the given Punnett squares shows a 100% probability that the cattle offspring will be homozygous dominant for red hair (represented as "RR"), we need to analyze each pairing of parent genotypes.

1. Parent 1 = rr; Parent 2 = rr

   • Possible Offspring: rr (0% RR)

2. Parent 1 = Rr; Parent 2 = rr

   • Possible Offspring: Rr, Rr, rr, rr (50% Rr, 50% rr; 0% RR)

3. Parent 1 = Rr; Parent 2 = RR

   • Possible Offspring: RR, RR, Rr, Rr (50% RR, 50% Rr)

4. Parent 1 = RR; Parent 2 = RR

   • Possible Offspring: RR, RR, RR, RR (100% RR)

Based on the analysis, the correct answer is:

Parent 1 = RR; Parent 2 = RR (This shows a 100% probability that the offspring will be homozygous dominant (RR) for red hair.)