top-rated free essay

Genetics Worksheet

By Lindzers86 Sep 12, 2014 537 Words
Associate Program Material

Genetics Worksheet

Review the images below and answer the follow-up questions.

Questions:

1. According to the pedigree, is cystic fibrosis inherited as a dominant or as a recessive trait? Explain how you made your conclusion using evidence from the pedigree and the principles of genetics.

Cystic Fibrosis is a recessive trait. You have to inherit two copies of the allele to have cystic fibrosis. If you have just one of these alleles you could be a carrier of cystic fibrosis, but have absolutely no symptoms. If two carriers of this allele have a child then there could be a one in four chance that child would have cystic fibrosis. I made my conclusion by using the evidence to see that from the pedigree and the principles of genetics that it had skipped generations. In this pedigree the parents don’t have cystic fibrosis but the child does. Both parents are heterozygous because the cystic fibrosis allele is recessive, but the children of these parents can inherit the allele.

2. What would a Punnett square that shows how the son in generation IV (marked with an A) inherited cystic fibrosis look like?

A- Not a carrier of cystic fibrosis
a- Carrier of cystic fibrosis

| | A | a |
| A | AA | Aa |
| a | Aa | aa |

Questions:

1. According to the pedigree, is Huntington’s disease inherited as a dominant or as a recessive trait? Explain how you made your conclusion using evidence from the pedigree and the principles of genetics.

Huntington’s disease (HD) is inherited as a dominant trait. An individual inherits HD (Huntington’s disease) when they inherit and expanded HD allele from one parent. The risk of having a child that will get HD depends on the size of the HD allele in the parent. If one parent has an allele with 40 or more repeats, all their children will have a 50% chance of inheriting the allele and getting Huntington’s disease. I made my conclusion by using the evidence to see that from the pedigree and the principles of genetics that from the male in the first generation it was continued to be passed down but not to everyone but that there is a 50% chance of them inheriting Huntington’s disease.

2. What would a Punnett square that shows how the first daughter in generation II (marked with a B) did not inherit Huntington’s disease look like?

B- Not a carrier for Huntington’s disease
b- Carrier for Huntington’s disease

| | B | b |
| b | Bb | bb |
| b | Bb | bb |

3. What is the role of chromosomes in the inheritance of genetic traits, such as cystic fibrosis and Huntington’s disease?

The role of chromosomes in the inheritance of genetic traits is to carry the genetic traits. Heredity is the passing of DNA from the chromosomes of one generation to the chromosome of the next. Chromosomes in your body are in pairs. One chromosome of each pair came from your mother and one from your father. There are many alleles in each chromosome. Different alleles determine different traits. For each allele there can be many different traits (Simon, Reee, & Dickey).

References
Simon, E.J., Reece, J.B., & Dickey, J.L. (2010). Campbell Essential Biology with Physiology. (3rd. Ed.). : Pearson Education, INC.

Cite This Document

Related Documents

  • heredity lab worksheet

    ...Name: Date: Instructor’s Name: Assignment: SCIE207 Phase 3 Lab Report Title: Heredity Lab Instructions: You will need to write a 1- page lab report using the scientific method to answer the following questions: State which genes are dominant (the genes that get expressed over the other genes) and which genes are recessive ...

    Read More
  • Genetics

    ...Associate Program Material Genetics Worksheet Review the images below and answer the follow-up questions. Questions: 1. According to the pedigree, is cystic fibrosis inherited as a dominant or as a recessive trait? Explain how you made your conclusion using evidence from t...

    Read More
  • Genetics Review

    ...Genetics Review DNA (Deoxyribonucleic Acid): Stored inside chromosomes and contain all instructions for life It is made up of Ribose (sugar), phosphate, and when of 4 Nitrogenous bases (Adenine, Thymine, Guanine and Cytosine) A Nucleotide consists of a Phosphate molecule, a sugar molecule, and a Nitrogenous base pair The nitrogenous...

    Read More
  • Genetics of Parenthood

    ...The Genetics of Parenthood Abstract: Why do people, even closely related people, look slightly different from each other? The reason for these differences in physical characteristics, or appearance, (called phenotype) is the different combination of genes (the genotype) possessed by each individual. All of your genes are segments of D...

    Read More
  • Genetics of Drosophilia

    ...Genetics of Drosophila First, Drosophila is the common fruit fly. The common fruit fly is some of the best organisms to study for genetic research and experimentation. This is true for a few reasons, the first of which is the small number of chromosomes which is 4, and that we have identified the genome. This means all traits are known and we...

    Read More
  • gene worksheet

    ...PS 1130A, Human Growth and Development Chapter 1 worksheet on genes Match the sentence with the word below. HUMAN GENETICS In humans, all cells (except eggs and sperm) contain 46 chromosomes. This diploid chromosomal number represents two complete (or nearly complete) sets of genetic instructions - one from the egg and the other from the sp...

    Read More
  • Genetics Problems. Bio 30

    ...Genetics Practice Problems, book #1 1. In peas, the gene for tallness is dominant to the gene for shortness. What offspring phenotypes and genotypes would be expected from the following crosses, and in what proportions? a. Heterozygous x heterozygous b. Heterozygous x homozygous tall c. Homozygous tall x h...

    Read More
  • Module 01 Lab Worksheet

    ...Module 01 Lab Worksheet: General Review Introduction This week’s lab will focus on reviewing the concepts of anatomical terminology, metric conversion and genetics, specifically the concept of dominant and recessive alleles in a human pedigree. Objectives Objectives for this week’s lab include: 1) Review anatomical terminology, 2) Dem...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.