Question

Which other crosses have a greater probability of producing Chihuahuas with the long-hair trait than the Hh x Hh cross? Select all that apply.
Group of answer choices

None of these crosses

Hh x hh

hh x hh

HH x. Hh

Answer 1

To determine which crosses have a greater probability of producing Chihuahuas with the long-hair trait than the Hh x Hh cross, we first need to understand the inheritance pattern for the hair length trait in Chihuahuas.

- Let's assume:
- H = allele for long hair (dominant)
- h = allele for short hair (recessive)

In the cross Hh x Hh:
- The possible genotypes are:
- HH (25%)
- Hh (50%)
- hh (25%)

This results in a 75% probability of producing a puppy with long hair (HH or Hh).

Now, let's analyze each of the other crosses based on their genotypes:

1. **Hh x hh**:
- Possible genotypes:
- Hh (50%)
- hh (50%)
- Probability of long hair (Hh) = 50%.

2. **hh x hh**:
- Possible genotypes:
- hh (100%)
- Probability of long hair = 0%.

3. **HH x Hh**:
- Possible genotypes:
- HH (50%)
- Hh (50%)
- Probability of long hair (HH or Hh) = 100%.

Now, comparing all these probabilities to the Hh x Hh cross (75%):

- Hh x hh = 50% (less than 75%)
- hh x hh = 0% (less than 75%)
- HH x Hh = 100% (greater than 75%)

From this analysis, the crosses that have a greater probability of producing Chihuahuas with the long-hair trait than the Hh x Hh cross are:

- **HH x Hh**

Therefore, the answer is:

**HH x Hh**