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Identify the parents genotype

(2 points)
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Question 2

This is a completed dihybrid cross from the above problem.

What is the probability of producing black running mice?

(1 point)
Responses

0%
0%

25%
25%

50%
50%

100%
100%

3 answers

To identify the parents' genotype and calculate the probability of producing black running mice from a completed dihybrid cross, we need some additional information about the traits involved (like the alleles for coat color and locomotion).

Typically, in a dihybrid cross, two traits are considered, often with each trait having two alleles. For example:

  • Let B be the allele for black fur and b for brown fur.
  • Let R be the allele for running and r for not running.

If we consider the typical scenario where both parents are heterozygous for both traits (BbRr x BbRr), we can set up a Punnett square to analyze the offspring.

  1. Punnett Square Analysis:

    • The combinations of alleles from each parent can give us a total of 16 combinations.
    • We are interested in the phenotype of black running mice, which would be BB or Bb (for black fur) and RR or Rr (for running).

  2. Counting the Desired Outcome:

    • The combinations for black running mice from a BbRr x BbRr cross can be:
      • BBRR
      • BBRr
      • BbRR
      • BbRr
    • There are 4 combinations that produce black running mice.

  3. Probability Calculation:

    • Since there are 16 total combinations (from a 4x4 Punnett square for two dihybrid parents), the probability of producing black running mice is: \[ \text{Probability} = \frac{\text{Number of black running mice outcomes}}{\text{Total outcomes}} = \frac{4}{16} = \frac{1}{4} = 25% \]

Based on this analysis, the probability of producing black running mice is 25%.

Summary:

  • Parents' genotype (assuming typical dihybrid cross): BbRr x BbRr
  • Probability of producing black running mice: 25%
what happens when you cross a heterozygous running, heterozygous black mouse with a homozygous running, homozygous black mouse
this is what it wants me to identify i need a sentace

When you cross a heterozygous running, heterozygous black mouse (BbRr) with a homozygous running, homozygous black mouse (BBRR), all offspring will exhibit black fur and be running, with a genotype of 50% BBrr and 50% BbRr.