Question: this week you started learning about mendelian genetics and mendels...
This week you started learning about Mendelian Genetics and Mendel’s Law. Punnett squares were introduced which is a useful way for predicting the allele composition of offspring from a cross between individuals of known genetic makeup. The parental generation (P) is the first set of parents crossed. The F1 (first filial) generation consists of all the offspring from the parents. You learned about The Law of Segregation as well as The Law of Independent Assortment.
Part l: Genes come in different alleles. A dominant allele hides a recessive allele and determines the organism's appearance. A Punnett square is a useful tool for predicting genotypes (allele combinations) and phenotypes (observable traits) of offspring from genetic crosses involving Mendelian traits. The Punnett square below depicts 2 parents who are heterozygous, ‘Aa’. Part I of this discussion assignment will be graded based on accuracy. At least 350 words.
1.Define phenotype and genotype in your own words (basically, don’t just copy/paste, paraphrase so you don’t have to use quotations).
- What would be the genotypic ratios be? What are the phenotypic ratios of: AA, Aa, Aa, aa? Be sure to give us the ratios in this format: 9:3:3:1 (this is just an example).
- Explain why they are the same or different.
Part ll: This section is to provoke some critical thinking and add some real-life application. Part lI of this discussion assignment will be graded based on thoroughness, not accuracy. At least 100 words.
Use the same cross above and try to think about some examples of how Mendellian genetics has improved everyday life or certain industries/business. Give me an example labelling ‘A’ and ‘a’ and how knowing an organism or human’s genotype can help us make decisions or improve our lives in some way.
I will start by giving you an example. You cannot use my example in your discussion.
Disease: Imagine that for disease X, it is only expressed if an offspring is homozygous for the dominant allele, such as AA in our situation. Those born with AA live tend to only live for 1 week. Luckily, disease X is very rare. Referencing to the Punnet square above, we have AA, Aa, Aa and aa. Therefore your child has a ¼ chance of expressing disease X. I think that research has provided modern medicine with tools such a genetic testing that is very important for parents who are carriers of disease X and other diseases that have detrimental effects on the offspring and may not be as rare.