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What does a punnet square show us?
The age of the offspring
The chance of a genotype (trait) showing up in offspring
Which set of traits goes at the top of the punnet square?
traits that appear in offspring
Which is Heterozygous?
Which is homozygeous?
What are the chances that the offspring will have homozygous recessive traits?
1 in 4
3 out of 4
What are the chances of heterozygous genotypes in offspring?
1 in 4
What is the dominant trait here?
If the father's genotypes are SS and the mothers are ss, the offspring will have:
Half will be SS, half ss
Only recessive genes
A recessive genotype will show when:
The offspring have both dominant and recessive genotypes
The offspring has two recessive genotypes
The offspring have two dominant genotypes
The mother has blue eyes
A father has brown hair (B), but the offspring have red hair (a recessive trait), like their mother (b). How is this possible?
It's not the real mother
It can't be the real father
The mother carries the dominant trait (Bb)
The father carries the recessive trait as well (Bb)