Allele Combinations and Gene Ratios

Feb 3rd, 2012
Studypool Tutor
Price: $5 USD

Tutor description

This document presents an introduction to genetics. Simple Mendelian situations are dealt with:dominant and recessive alleles and their combinations. An interesting feature is the use of human phenotypes like tongue-rolling and sickle-cell anemia to give substance and importance to the topic. Diagrams supplement the explanation, and solutions to the exercises are provided. Some work on ratio of phenotypes is presented informally.

Word Count: 852
Showing Page: 1/5
Genetics: Genes and allelesImportant : the gene is a unit of inheritance. The complete set of genes determines your genotype.Your phenotype is how these genes determine your appearance or other observable traits Alleles are different versions of the same gene. Four important points to note are worth noting:1. Genes occur in pairs (unless there is a fault). You have two versions of each gene.2. You receive one gene from one parent, and another one from the other parent, making a pair of genes.3. For some simple characteristics (phenotypes) two genes are responsible, but many are determined by more than just two. Here, we will study only the simple situation.4. Usually one gene is dominant - written with a Capital letter, while the other is recessive- written with a small letter. A dominant gene will be expressed (shows itself in the phenotype), a recessive gene does not express itself.To understand these concepts better, consider the gene that allows you to roll your tongue G and the other version g, which does not.In the diagrams below two possible situations are considered.(1) From Father G g From Mother G GG Gg g gG gg(2) From Father

Review from student

Studypool Student
" Thanks for the help. "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1825 tutors are online

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors