Two rabbits mate, one is homozygous dominant (FF) and one is homozygous recessive (ff). The dominant gene is black and the recessive is white. How many offspring out of every four will be white? (complete a Punnett square to help yourself)

Question

zero

three

one

two

Answer 1

To determine the offspring from the cross between a homozygous dominant rabbit (FF) and a homozygous recessive rabbit (ff), we can set up a Punnett square.

1. The first parent (FF) contributes two alleles: both are F (dominant for black).
2. The second parent (ff) contributes two alleles: both are f (recessive for white).

The Punnett square looks like this:

     F   |   F
  -----------------
f |  Ff  |  Ff
  -----------------
f |  Ff  |  Ff

From the Punnett square, we can see that all offspring will be Ff, which means they will all be black (since F is dominant).

Conclusion: Out of every four offspring, there will be zero white rabbits.