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.

Question

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