Biology Di-hybrid cross question (please help)?

Heterozygous dog: EeBb
Droopy-eared, silent trailer dog: it has to be all recessive because if you had any dominant alleles the dominant allele would be expressed: eebb.

EeBb x eebb

Now eebb can only ever produce eb gametes.

So you find the possible outcomes of EeBb:
Remember you must have one letter e (or E) and one letter b (or B) in each gamete.

I won't tell you the answer, but i will give you a clue.

Firstly: for EeBb, there are four possible gametes that can be produced.

Secondly:
If the genotypes of two organisms, for a particular trait were:
AAbb and aabb

If you crossed AAbb with aabb you get:
aabb only ever producing ab genes (no other combination).

AAbb producing only Ab genes (no other combination).

Combine the possibilities:

ab x Ab = Aabb

The offspring will ever only be Aabb.

If you can work out the possible gametes, you can work out the genotype. If you can do that, you can work out question a and b.


Question C:
Heterozygous for both the traits in this case means that there is one of each allele.
So it would have E, e, B and b alleles.

Crossing EeBb x EeBb can produce what different types of gametes? From that you can determine the answer to the question.

If you need more help you can contact/add me.

Good luck.