Episode 1: Traits, Genes, and Alleles Series: Genetics Season 2: Of Germs and Genes Episode 1: Traits, Genes, and Alleles Objective: Infer an individual’s genotype based on their phenotype Bell Ringer: Get the article from the front. Read and annotate the article using your annotation key from your notebook. Write a 1 paragraph summary and reaction using your annotations as a guide

I. Genes encode proteins that produce a diverse range of traits.

1. An allele is any alternative form of a gene occurring at a specific location on a chromosome.

1. An allele is any alternative form of a gene occurring at a specific location on a chromosome. a. Each parent donates one allele for every gene.

1. An allele is any alternative form of a gene occurring at a specific location on a chromosome. a. Each parent donates one allele for every gene. b. Homozygous: two same alleles

1. An allele is any alternative form of a gene occurring at a specific location on a chromosome. a. Each parent donates one allele for every gene. b. Homozygous: two same alleles c. Heterozygous: two different alleles

1. An allele is any alternative form of a gene occurring at a specific location on a chromosome. a. Each parent donates one allele for every gene. b. Homozygous: two same alleles c. Heterozygous: two different alleles

1. An allele is any alternative form of a gene occurring at a specific location on a chromosome. a. Each parent donates one allele for every gene. b. Homozygous: two same alleles c. Heterozygous: two different alleles

A. Genes influence the development of traits.

A. Genes influence the development of traits. A genotype refers to the genetic makeup

Aa A. Genes influence the development of traits. A genotype refers to the genetic makeup Genotype: Aa

Aa A. Genes influence the development of traits. A genotype refers to the genetic makeup A phenotype is the physical expression of a trait Genotype: Aa

Aa A. Genes influence the development of traits. A genotype refers to the genetic makeup A phenotype is the physical expression of a trait Genotype: Phenotype: Aa

3. Alleles can be represented using letters

3. Alleles can be represented using letters Dominant:

3. Alleles can be represented using letters Dominant: CAPITAL LETTERS

3. Alleles can be represented using letters Dominant: CAPITAL LETTERS Expressed when at least one allele is dominant: RR, or Rr

3. Alleles can be represented using letters Dominant: CAPITAL LETTERS Expressed when at least one allele is dominant: RR, or Rr

b. Recessive:

b. Recessive: lowercase letters

b. Recessive: lowercase letters Expressed only when two copies are present: rr

b. Recessive: lowercase letters Expressed only when two copies are present: rr

HUMAN GENETICS ACTIVITY COMPLETE THE HUMAN GENETICS ACTIVITY IN YOUR LAB NOTEBOOK RETURN THE INSTRUCTION SHEET BY THE END OF CLASS