Exploring Dominant and Recessive Traits – A Family Genetics Overview

Exploring Dominant and Recessive Traits – A Family Genetics Overview

Trait Chosen: Freckles

Parents’ Genotypes:

Mother: No freckles (ff) – homozygous recessive

Father: Freckles (Ff) – heterozygous

Punnett Square

If the father is heterozygous (F)

	f (mother)	f (mother)
F (father)	Ff	Ff
f (father)	ff	ff

Outcome

50% chance of Ff (child with freckles)

50% chance of ff (child without freckles)

Conclusion

Genotypes and Phenotypes

Mother: ff (No freckles)

Father: Ff (Freckles)

Child: Ff (Freckles)

This Punnett square shows that if the father is heterozygous (Ff) and the mother is homozygous recessive (ff), there is a 50% chance for the child to inherit the dominant allele from the father and the recessive allele from the mother, resulting in the genotype Ff, and a 50% chance for the child to inherit the recessive allele from both parents, resulting in the genotype ff. This conclusion aligns with Mendelian inheritance patterns for a single gene with dominant and recessive alleles (Zschocke et al., 2023). As supported by Yeroshenko et al. (2021), the presence of freckles in the child when one parent has freckles and the other does not is explained by the inheritance of one dominant allele from the heterozygous parent.

References

Yeroshenko, H. A., Klepets, O. V., Kinash, O. V., Perederii, N. A., Vatsenko, A. V., Ulanovska-Tsyba, N. A., … & Shevchenko, K. V. (2021). Organismic level of life organization. Bases of human genetics. https://repository.pdmu.edu.ua/handle/123456789/18311

Zschocke, J., Byers, P. H., & Wilkie, A. O. (2023). Mendelian inheritance revisited: dominance and recessiveness in medical genetics. Nature Reviews Genetics, 24(7), 442-463.

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DISCUSSION BOARD #1 FAMILIA TRAITS

PROFESSOR INSTRUCTIONS: Look at the list of simple Mendelian traits below:

Choose a trait from the list above and describe if you are dominant or recessive for that trait. Do the same for your parents, alternatively, if you have children you can do this with your and your partner’s traits and your child(ren), or you can choose a set of parents and children that you know as examples for this exercise.

In your response be sure to list how both parents and their child(ren) are expressing the trait, and what the potential GENOTYPES are for each individual. What are the possibilities for the parental pair based on their possible genotypes (hint: Punnet Square).

CREATE A CHART OF YOUR OWN AS WELL I ATTACHED MY CLASSMATE’S DISCUSSION BOARD RESPONSES BELOW SO YOU CAN USE IT AS AN EXAMPLE TO SEE HOW THIS CAN BE DONE.