Dihybrid Crosses (Grade 12 NSC Matric Life Sciences): Flashcards
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Dihybrid cross definition
Dihybrid cross definition
Genetic cross examining inheritance of two different traits
Law of Independent Assortment
Law of Independent Assortment
Alleles for different genes separate independently in meiosis
Gamete types from TtPp parent
Gamete types from TtPp parent
Four different types
Four gametes from TtPp
Four gametes from TtPp
TP, Tp, tP, tp
Punnett square size for dihybrid cross
Punnett square size for dihybrid cross
4×4
Phenotypic ratio for TtPp × TtPp
Phenotypic ratio for TtPp × TtPp
9:3:3:1
Dominant trait expression condition
Dominant trait expression condition
At least one capital (dominant) allele present
Recessive trait expression condition
Recessive trait expression condition
Both alleles are lowercase (recessive)
Total offspring in 4×4 Punnett square
Total offspring in 4×4 Punnett square
16
What each gamete must contain
What each gamete must contain
One allele from each characteristic