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.
• None of these crosses
• Hh x hh
O HH x. Hh
• hh x hh

Answer 1

To understand which crosses might produce Chihuahuas with the long-hair trait (typically represented by the allele "H"), we first need to clarify the genetics involved.

Assuming:
- "H" (dominant) = long hair
- "h" (recessive) = short hair

In the cross **Hh x Hh**, the potential genotypes of the offspring are:
- HH (25% chance)
- Hh (50% chance)
- hh (25% chance)

Probability of getting long-haired Chihuahuas (HH or Hh):
- 25% (HH) + 50% (Hh) = 75%

Now, let's evaluate the other crosses:

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

2. **HH x Hh**:
- Possible offspring genotypes:
- HH (50%)
- Hh (50%)
- Probability of long-haired offspring (HH or Hh) = 100%

3. **hh x hh**:
- Possible offspring genotype:
- hh (100%)
- Probability of long-haired offspring = 0%

Based on this analysis, the crosses that have a greater probability of producing Chihuahuas with the long-hair trait than the **Hh x Hh** cross (75%) are:

- **HH x Hh** (100%)

The **Hh x hh** cross (50%) and **hh x hh** cross (0%) have lower probabilities than the Hh x Hh cross.

So the answer is:
- **HH x Hh**