Question

1. Show your work using a Punnett square. Cross a homozygous dominant (black) rabbit with a homozygous recessive (white) rabbit. Fur color is inherited on the autosomes. What % of the progeny will be homozygous dominant, heterozygous, and homozygous recessive? B = dominant allele, codes for black; b = recessive allele, codes for white in the homozygous condition.2. Show your work using a Punnett square. Using the trait in the above example, cross a heterozygous rabbit with a heterozygous rabbit. What % of the progeny will be homozygous dominant, heterozygous, and homozygous recessive?

Answer 1

Answer:

1. 0% will be homozygous dominant, 100% will be hetrozygous, 0 % will be homozygous recessive

2. 25% will be homozygous dominant, 50% will be hetrozygous, 25 % will be homozygous recessive

Explanation:

1. see the attachment for Punnet square

BB: homozygous(black) rabbit

bb: homzygous ( white) rabbit

2. see the attachment for Punnet square

Bb: hetrozygous(brown) rabbit

Answer 2

Answer: 1) Bb = 100%; 2) BB = 25%, Bb = 50%, bb = 25%;

Explanation: The Punnett Square is a diagram in which shows the possible genotypes of a particular cross or breeding experiment.

1.) The crossing is between homozygous dominant and homozygous recessive or BB x bb. The Punnett Square is:

        b        b

B     Bb      Bb

B     Bb      Bb

So, as we can see from it, the crossing will give a progeny with heterozygous trait only or 100% Bb

2.) The crossing is between two heterozygous or Bb x Bb. The Punnett Square is:

       B       b

B    BB     Bb

b    Bb      bb

We can see this crossing gives a bigger variety of traits:

The progeny with genotype BB or homozygous dominant has 25% chance of happening.

For genotype Bb of heterozygous, it has a 50% chance of occuring.

For homozygous recessive or bb, it is a probability of 25%.