lecture 5

Question 1

Define: genotype vs phenotype; haploid vs diploid; homozygote vs heterzygote vs hemizygote; gene vs allele vs locus; dominant vs recessive; homologus vs non-homologus

Question 2

Explain Monohybrid crosses

Answer 2

• Law of Dominance
• found genes exist in pairs
• 3:1 ratio
• cross homozygous parents and heterozygous F1 -> count F2

Question 3

Explain Test crosses

Answer 3

• individual of uk geno with tester
• organism is homo recessive for all allels and loci is being test
• Law of segregration
• alleles separate in Meiosis 1
• expect a 1:1 ratio

Question 4

Explain dihybrid crosses

Answer 4

• Law of independent assortment; unlinked or distantly linked segregating gene pairs assort idenpendently at emiosis
• 9:3:3:1
• perfrome when you want to know how genes interact

Question 5

Explain in reciprocal crosses

Answer 5

• Thomas Hunt Morgan’s experiments were the first evidence that genes are locaton on chr
• determining if a gene is sex-linked