Which of the following pair of genes represents the cross between two heterozygous brown coat rabbits?

Question

Which of the following pair of genes represents the cross between two heterozygous brown coat rabbits? (B = brown coat, dominant; b = white coat, recessive)

Answer 1

This looks like a multiple choice question without the choices.

The "hetero" in hertozygous means different, so that's a clue for you that the genetics of the parents include one of each allele (Bb).  "Homo" means the same, so homozygous dominant (BB) and homozygous recessive (bb) have both alleles alike.

So for a cross of heterozygous parents, you'd have Bb x Bb.  Just set this up as a Punnett square:

___|_B_|_b_|

_B_|___|___|

_B_|___|___|

Make the cross by combining the letter at the top and letter at the side, then and count how many you'd get of each type.  If you put the capital letter (if one is present) first, that will make it easier to count.

Answer 2

Bb x Bb makesssss...

Genotypic ratio:

1BB:2Bb:1bb

Phenotypic ratio:

3 Brown: 1 white

Not a hard cross at all!  Here's how you do it:

http://www.newenglandreptile.com/graphic...

[Replace Ns with Bs, and disregard the fact that it comes from a pot growing site.]