Genetic Diagrams (Grade 12 NSC Matric Life Sciences): Flashcards
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Phenotype
Phenotype
Observable characteristics of an organism
Genotype
Genotype
Genetic makeup represented by letters (e.g. TT, Tt, tt)
Homozygous
Homozygous
Both alleles for a trait are the same (TT or tt)
Heterozygous
Heterozygous
Two alleles for a trait are different (Tt)
Monohybrid cross
Monohybrid cross
Examines inheritance of a single characteristic
Phenotypic ratio in complete dominance (Rr × Rr)
Phenotypic ratio in complete dominance (Rr × Rr)
3:1 ratio (3 dominant : 1 recessive)
Incomplete dominance result
Incomplete dominance result
Alleles blend to create intermediate phenotype
Co-dominance result
Co-dominance result
Both alleles expressed simultaneously in phenotype
Sex chromosomes in females and males
Sex chromosomes in females and males
Females: XX, Males: XY
Sex determination ratio
Sex determination ratio
1:1 (50% males : 50% females)