Week 14.1: Genetics Lab

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Genetics Lab Day 1

Welcome to Week 14!

• Complete Exam 4 this week

• We only have three weeks of class left!

• Please let me know if there's any issues with grades

• Week 14 assignments are due on Sunday, 11/24 at 11:59pm

Reminders

• Same format as prior exams - on Canvas with Respondus Lockdown Browser

• Will open Monday, 12/9 at 12:00AM and will close Friday, 12/13 at 11:59pm

• Covers content from the entire semester (Week 1-16)

• I will post a study guide next week!

Final Exam Information

• Alleles are different versions of the same gene

• In diploid organisms:

• Each gene will have two alleles, one on each homologous chromosome

Alleles

• Each allele will have different levels of expression

• Types of allele dominance:

• Dominant allele - version of the gene that will be expressed if present

• Recessive allele - version of the gene that will not be expressed if present with a dominant allele

• Codominant allele - you will learn about this one in the lecture

Allele Dominance

Recessive allele (lowecase letter)

Dominant allele (uppercase letter)

• Each allele will have different levels of expression

• Types of allele dominance:

Allele Dominance

• Genotype - specific nucleotide sequence for a gene but usually shortened as two letters

• Types of genotypes:

• Homozygous dominant - both alleles are the dominant allele

• Homozygous recessive - both alleles are the recessive allele

• Heterozygous - one allele is dominant and the other is recessive

Genotypes

Heterozygous

Homozygous recessive

Homozygous dominant

• Genotype - specific nucleotide sequence for a gene but usually shortened as two letters

• Types of genotypes:

Genotypes

• Complete the Day 1 lab manual during class today:

• Part 1 - Examine a Reebop karyotype and the appearance of the parent Reebops

• Part 2 - Examine the parents' karyotypes

• Part 3 - Build a baby Reebop!

Day 1: Reebops!