Punnett squares. The tool which uses the combination of alleles to predict the probability of traits showing up in offspring.

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Presentation transcript:

Punnett squares

The tool which uses the combination of alleles to predict the probability of traits showing up in offspring.

Green eyes are dominant and yellow eyes are recessive. The genotype of the two insects are Gg and Gg. Complete a Punnett square!

G Gg Gg GG g G g ??

What % of the young would have green eyes? Yellow eyes? 75% 25%

If B=black and b=brown and two wolves are heterozygous Bb and homozygous bb what would their young be? Complete a Punnett square!

B Bb bb Bb b b b bb

What % of young would be black and what % would be brown? Black = 50 % Brown = 50 %

B=Brown eyes which are dominant, b=blue eyes which are recessive What are the alleles of the parents for the following chart?

B Bb Bb BB b B b bb

The parents would be Bb and Bb and both would have brown eyes!

What percent of your genes come from each parent? 50%

What % of genes come from each grandparent? 25%

If green snake skin is dominant and yellow is recessive, what are the alleles of the parent snakes for the following:

G Gg Gg Gg g g G Gg

Homozygous (GG) green Homozygous (gg) yellow

If big ears are dominant and both parents are homozygous dominant, what percent of babies will have big ears?

E EE EE EE E E E EE

100%

Dimples is dominant and not having dimples is recessive. If mom is homozygous dominant and dad is heterozygous, what percent of young will have Dimples?

D Ff FF FF d D D Ff

100%

Big noses are dominant and little noses are recessive. If Dad is heterozygous and mom is homozygous recessive, what percent of children will have big noses?

N Nn nn Nn n n n nn

100%

Short is dominant and tall is recessive. If dad is heterozygous dominant and mom is homozygous recessive, what percent of the children will be short and tall?

S Ss’ s’s’ Ss’ s’ s’s’

50% short 50% tall

Long neck is dominant and short neck is recessive. If dad is heterozygous dominant and mom is heterozygous dominant, what percent of the offspring will have long necks and short necks?

N Nn Nn NN n N n nn

75% Long 25% Short

Short tongues are dominant and long are recessive. If mom is homozygous recessive and dad is homozygous recessive, what percent of the offspring will have long tongues?

t tt tt tt t t t tt

100%