Joe has freckles but Sue does not. Both have attached earlobes. Some of their children do not have freckles. Freckles and earlobes are inherited independently.

What is Joe's genotype?
What is Sue's genotype?
What is the chance that their next child will have both freckles and attached earlobes?
Could any of their children have unattached earlobes?
Please Include the Punnett Square.

Without knowing which traits are dominant or recessive, it impossible to answer these questions.

Use the information that I have posted to your other question to figure out the genotypes for each person for each trait, then combine the genotypes to do the Punnett square.

I hope this helps. Thanks for asking.

3 answers

24 igk

To determine the genotypes of Joe and Sue, we need to understand the inheritance pattern for freckles and attached earlobes. Let's assume that the presence of freckles (F) is dominant over no freckles (f), and attached earlobes (E) are dominant over unattached earlobes (e).

Since Joe has freckles, he can either be homozygous dominant (FF) or heterozygous (Ff) for the freckles trait. Sue, on the other hand, does not have freckles, so she must be homozygous recessive (ff) for the freckles trait.

Both Joe and Sue have attached earlobes, so they can both be either homozygous dominant (EE) or heterozygous (Ee) for the earlobe trait.

Now, let's determine the genotypes and chances for their next child:

To do this, we need to consider a Punnett square. Since Joe's genotype for freckles can be either FF or Ff, and Sue's genotype for freckles is ff, the potential genotypes for their child regarding freckles would be Ff (50% chance) or ff (50% chance).

For the attached earlobes, since both Joe and Sue have either EE or Ee, all potential genotypes for their child would have attached earlobes (EE, Ee, Ee, ee), with a 100% chance.

Combining the potential genotypes for freckles and attached earlobes, the chances for their next child are as follows:
- FfEe: 50% chance
- FfEE: 50% chance
- ffEe: 0% chance
- ffEE: 0% chance

None of their potential children would have unattached earlobes, as they both have the dominant allele for the earlobe trait.

Here's a simplified Punnett square to visualize the possible combinations:

E e
F FfEE FfEe
f - -

I hope this explanation helps you understand how to determine genotypes and use a Punnett square to analyze inheritance patterns. If you have any further questions, feel free to ask!