ARCL-1006EL Lecture Notes - Lecture 3: Chin, Zygosity, Phenotype
2 pages36 viewsWinter 2018
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January, 17, 2018
•Recap of Mendel’s peas experiment
•That both parents contribute “unit factors” or what we would call GENES to the off-spring
•When the genes are different only one is expressed (excluding co-dominant)
•When gametes (sex cells) are formed, paired genes separate randomly so each sex cell
receives one or the other gene with equal likelihood
•Phenotype: the observable physical appearance of the organism
•Gene: chemical unit of heredity
•Allele: alternate forms of a gene
•Genotype: the total complement of inherited genes of an organism
•Homozygous: individual carries the same allele for a speciﬁc gene
•Heterozygous: individual carries different alleles for a speciﬁc gene
•Dominant gene: expressed allele
•Recessive gene: unexpressed allele
•Co-dominiant: both alleles expressed
•Alleles and Dominance in human blood groups
•Alleles: A, B, O
•Dominant: A & B (co-dominant)
•Phenotypes and Genotypes
•person with blood type A has what possible genotypes?
•A -> AA OR AO
•Parents with blood types A and B would have offspring that might have what blood types?
•A,B,O or AB
•Coded by a single gene:
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