Textbook Notes (363,260)
United States (204,477)
Biology (332)
BIOL 133 (3)
Chapter 1

Chapter 1.docx

2 Pages
Unlock Document

Pennsylvania State University
BIOL 133
Denise Woodward

Bio 133 Chapter 1- Overview of genetics Important Terms • Genes and alleles • DNAand RNA • Chromosomes • Genome • Genotype • Phenotype • Karyotype • Genetic Testing Genes and Alleles Gene – segment of DNA(a gene codes for production of a protein) Allele – variant of a gene Example: Sickle-cell anemia • Caused by mutated gene - codes for component of hemoglobin. • An allele of the gene codes for a defective hemoglobin. • Result is sickle-cell anemia. DNAand RNA • DNA = Deoxyribonucleic acid. – 4 DNAbuilding blocks:A, T, G, C – Double-stranded • RNA = Ribonucleic acid. Intermediary between genes and proteins. – 4 RNAbuilding blocks:A, U, G, C – Single-stranded Chromosomes • Long strand of DNAand proteins. Each chromosome contains many genes. • Humans: 46 chromosomes in all cells except sperm and eggs. – 23 from mom – 23 from dad Genomes • All genes in cells of a particular type of organism. • Human genome is approximately 20,000 genes • Corn has 30,000 genes and the worm C. elegans has 10,000 Genotype and Phenotype Genotype – alleles an organism contains Phenotype – how those alleles are expressed (what the organism looks like). Ex: Flower color PP = purple Pp = purple pp = white Karyotype • Chart that displays chromo
More Less

Related notes for BIOL 133

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.