High School

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In rabbits, a black nose is dominant to a pink nose. Also in rabbits, long straight ears are dominant to floppy ears. Here are the genotypes and phenotypes for the rabbits:

- **Nose Color:**
- BB - black nose
- Bb - black nose
- bb - pink nose

- **Ear Type:**
- EE - long ears
- Ee - long ears
- ee - floppy ears

A male rabbit with the genotype BBee is crossed with a female rabbit with the genotype bbee. Fill out the Punnett square and determine the phenotypes and proportions in the offspring.

How many out of 16 offspring have:

1. Black noses and long ears?
2. Black noses and floppy ears?
3. Pink noses and long ears?
4. Pink noses and floppy ears?

Answer :

In this genetics problem involving rabbits, we're dealing with two separate genetic traits: nose color (black vs. pink) and ear type (long straight vs. floppy). We'll use the provided genotypes to create a Punnett square and analyze the offspring.

Given Genotypes:

  • Male (BBee): This means the male rabbit has a genotype homozygous dominant for black nose (BB) and homozygous recessive for floppy ears (ee).
  • Female (bbee): This means the female rabbit has a genotype homozygous recessive for both pink nose (bb) and floppy ears (ee).

Punnett Square Setup

Since we're looking at two traits, we'll focus first on each trait separately:

Nose Color:

  • Male contributes either B (always dominant black)
  • Female contributes only b (recessive pink)

Ear Type:

  • Male contributes only e (recessive floppy)
  • Female contributes only e (recessive floppy)

Combined Genotypes for Offspring

  • Nose: Every offspring will inherit Bb (heterozygous for black nose) since B (from the male) is dominant over b (from the female).
  • Ears: Every offspring will inherit ee (homozygous recessive for floppy ears).

Punnett Square

Since all offspring have the same genetic makeup for both traits, the Punnett square confirms that:

  • Nose Color: All Bb (black nose)
  • Ear Type: All ee (floppy ears)

Phenotypic Outcomes

  1. Black noses and long ears: 0 out of 16
  2. Black noses and floppy ears: 16 out of 16
  3. Pink noses and long ears: 0 out of 16
  4. Pink noses and floppy ears: 0 out of 16

Conclusion

All the offspring will display the phenotype of a black nose and floppy ears, specifically because every produced rabbit inherits a dominant black nose trait from the parents and the homozygous recessive floppy ear trait. This situation, based on our Punnett square results, does not produce any other phenotype combination.

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