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Chance or probability is the basis of genetic inheritance. In this Punnett square, you can see the possible alleles for the fur color of mice.

Bb x Bb
B b
B BB Bb
b Bb bb
B- allele for black hair
b- allele for white hair
B is the allele for black, and b is the allele for white. If a rat has black fur, the pair of alleles the rat possesses must be BB or Bb. If a rat has fur that is white, it must have the allele combination bb.

Fill in the chart based on the information in the Punnett square.
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Out of 4 offspring, fraction that should be black Percent of offspring that will most likely be white. Probability that a baby mouse will be white Ratio of black mice to white mice.

1 answer

Based on the information from the Punnett square created from the cross of Bb x Bb, we can analyze the possible outcomes for the offspring. Here’s how to fill in the chart:

  1. Out of 4 offspring, the fraction that should be black:

    • From the Punnett square, the phenotypes for fur colors of the offspring are:
      • 1 BB (black)
      • 2 Bb (black)
      • 1 bb (white)
    • Total black offspring = 1 BB + 2 Bb = 3
    • Fraction that should be black = 3/4.

  2. Percent of offspring that will most likely be white:

    • Total white offspring = 1 bb
    • Percent of offspring that will most likely be white = (1/4) * 100% = 25%.

  3. Probability that a baby mouse will be white:

    • Probability of a baby mouse being white is equal to the fraction of white offspring, which is 1/4 or 0.25.

  4. Ratio of black mice to white mice:

    • Total black mice = 3
    • Total white mice = 1
    • Ratio of black mice to white mice = 3:1.

Thus, the responses to fill in the chart are:

  • Fraction that should be black: 3/4
  • Percent of offspring that will most likely be white: 25%
  • Probability that a baby mouse will be white: 1/4
  • Ratio of black mice to white mice: 3:1