1. 525 jackrabbits in the desert. Big ears (B) are dominant among jackrabbits, while stubby ears (b) are recessive. Of the study of this population, 189 rabbits have stubby ears.

1.The frequency of the "bb" genotype
2.The frequency of the "b" allele
3.The frequency of the "B" allele
4.The frequencies of the genotypes "BB" and "Bb"
5.The frequencies of the two possible phenotypes in your study population.

  1. 👍 0
  2. 👎 0
  3. 👁 122
  1. B+b=1,


    genotype BB=Big ears

    genotype Bb=Big ears

    genotype bb=Stubby ears

    Since each rabbit has two alleles for ear type, 525*2=1,050 total alleles

    Since 189 rabbits have the genotype bb, 189/525= 0.36, the phenotype frequency for stubby ears. This means that 1-0.36=0.64, the phenotype frequency for big ears.

    plugging in the value for bb that we obtained into BB+2Bb+bb=1, we get

    BB+2Bb+0.36=1 rearrangement gives,


    Since the genotype frequency is 2;1 for Bb:BB, I will let BB=x, and Bb=2x, and solve for x.


    x=0.213, meaning 21.3% of the remaining population of jackrabbits have the genotype BB (112 jackrabbits), and the other 42.6% have the genotype Bb (224 jackrabbits). Converting to decimals gives you the genotype frequencies:

    Genotype BB frequencies= 0.213
    Genotype Bb frequencies= 0.426

    To determine the frequency of B alleles, multiply [(112*2)+(224*(1/2))]/total number of alleles(1,050)=0.32

    Since B+b=1, solving for b


    1. 👍 0
    2. 👎 0
    posted by Devron
  2. Remember, the 0.36 that wal calculated for the phenotype frequency of bb is the same as the genotype frequency.

    1. 👍 0
    2. 👎 0
    posted by Devron

Respond to this Question

First Name

Your Response

Similar Questions

  1. Genetics

    In some breeds of dogs, a dominant gene controls the characteristic of barking while trailing. In these dogs, another independent gene produces erect ears; it is dominant of its allele for drooping ears. Suppose a dog breeder

    asked by Samantha on May 8, 2019
  2. biology 3

    the curled ears of the american curl cat are caused by an autosomal dominant allele. What are the chances of a heterozygous female and a homozygous recessive male producing offspring with curled ears?

    asked by Hannah on April 17, 2014
  3. math

    A store sells 3 ears of corn for $1. They round prices to the nearest cent as shown below. Tell whether you would describe the relatioship between cost and number of ears of corn as proportional relationship. Justify your answer.

    asked by kimie on October 8, 2015
  4. Science

    The mole is an animal that digs tunnels. Which of the following characteristics would NOT be an advantage to a mole? A.Sharp claws B.Large Ears C.Small Ears D.Strong Legs b because large ears would get in the way of the digging

    asked by Melthea on January 22, 2007
  5. math

    there r 6 ears of yellow and 2 ears of white corn in each bag.There r 8 bags. How many ears of corn are there?

    asked by asia on October 12, 2010
  6. 3 grade english

    a cause tells why something happened. as effect is what happened. words such as because and so are clues that can help you figure out a cause and its effect. a desert is very hot during the day, so many desert animals are

    asked by dw on February 2, 2012
  7. biology

    The American curl is a breed of cat that has curly ears. The allele for curly ears is dominant. Suppose a male cat with the heterozygous genotype is bred to a female cat with the homozygous recessive genotype. Predict the number

    asked by marie on October 21, 2015
  8. English

    1. All the money was gone. 2. All the money disappeared. (Are both the same?) 3. Chandra examined the elephants and found a problem with their ears. (What is the meaning of 'with' in this sentence? On/In which part did the

    asked by rfvv on August 29, 2011
  9. math

    His farn yields 5,000 ears of corn per season. Each year he plans to double the amount of corn his farm will yield. If this occurs, how ears of ears of corn will his farm yield during the fourth year?

    asked by anonymus on April 10, 2014
  10. Science

    How do I draw a graph comparing eyes & ears. If you remember numbers better with your eyes or ears?

    asked by Nick on February 20, 2013

More Similar Questions