Question

For this week's CRQ, you are to design your own genetic cross between a female and a male. Be sure to include each of the following within your cross and then you will need to provide the solution as well.

1. What are the dominant and recessive traits in cross?
2. Is the male homozygous dominant, homozygous recessive, or heterozygous?
3. Is the female homozygous dominant, homozygous recessive, or heterozygous?

In your answer, provide the following as well:
1. genotypes and phenotypes for parent and offspring



If you want to insert an image of your cross, you may as well but NOT required.



Please write in complete sentences.

Answer 1

In humans the separated ear feature is dominant and the attached ear is recessive, thus establishing a genetic cross between a man with attached ears and a woman with separated ears.

Step-by-step explanation:

1. What are the dominant and recessive traits in cross?

For the morphological character of the ear, "A" represents separate ear (dominant) and attached ear (recessive).

2. Is the male homozygous dominant, homozygous recessive, or heterozygous?

♂ Homozygous recessive (aa)

It is known that the united ear - being the recessive allele - must manifest as recessive homozygous.

3. Is the female homozygous dominant, homozygous recessive, or heterozygous?

⧬ Heterozygous (Aa)

It can be assumed that the woman is heterozygous for this characteristic.

Genotypes and phenotypes for parent and offspring

The genotypes and phenotypes of the parents and offspring, according to the crossing, would be:

Parents:

Genotypes aa & Aa

Phenotypes father with united ears and mother with separated ears.

Alleles a a

A Aa Aa

a aa aa

Offspring genotypes and phenotypes

• Aa (heterozygous) ears separated 50%.
• aa (recessive homozygotes) ears joined 50%.