Dihybrid Cross (Leaving Cert Biology): Flashcards
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Define dihybrid cross
Define dihybrid cross
Mating where two separate genes are studied simultaneously
How many genes studied in dihybrid cross?
How many genes studied in dihybrid cross?
Two
How many alleles does each gene have?
How many alleles does each gene have?
Two (dominant and recessive)
How many alleles per gene do gametes carry?
How many alleles per gene do gametes carry?
One allele for each gene
Tool to predict allele combinations in crosses?
Tool to predict allele combinations in crosses?
Punnett square
Define allele
Define allele
Different form of the same gene
Define dominant allele
Define dominant allele
Allele that masks effect of recessive allele
Define recessive allele
Define recessive allele
Allele prevented from working by dominant allele
Genotype from TTPP x ttpp cross?
Genotype from TTPP x ttpp cross?
100% TtPp
Phenotypic ratio: TtPp x TtPp?
Phenotypic ratio: TtPp x TtPp?
9:3:3:1
How many gametes can TtPp produce?
How many gametes can TtPp produce?
Four (TP, Tp, tP, tp)
When is 9:3:3:1 ratio typical?
When is 9:3:3:1 ratio typical?
Dihybrid cross between heterozygous parents