Tongue rolling allele is dominant (R) Non tongue rolling allele is recessive (r ) - PowerPoint PPT Presentation

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Tongue rolling allele is dominant (R) Non tongue rolling allele is recessive (r ) Both parents are both heterozygous for the tongue rolling gene. What is the probability that: a) their firstborn child is a non tongue roller? b) the second child is also a non tongue roller?

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Tongue rolling allele is dominant (R) Non tongue rolling allele is recessive (r )

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Tongue rolling allele is dominant r non tongue rolling allele is recessive r

Tongue rolling allele is dominant (R)

Non tongue rolling allele is recessive (r)

Both parents are both heterozygous for the tongue rolling gene.

What is the probability that:

a) their firstborn child is a non tongue roller?

b) the second child is also a non tongue roller?

c) the third child is a tongue roller?


Tongue rolling allele is dominant r non tongue rolling allele is recessive r

Mother = Rr

Father = Rr

Mother

R

r

RR

R

Rr

Father

r

Rr

rr


Tongue rolling allele is dominant r non tongue rolling allele is recessive r

Farmer Ted has a curly tailed male pig and wants to know whether it is pure breeding or not. He has asked you to find out for him. He pays you $400.

Curly tails (T) are dominant over straight tails (t).

Write your answer on your book


Tongue rolling allele is dominant r non tongue rolling allele is recessive r

Pure Breeding

Male = TT

Female= tt

Male

T

T

Female

Tt

t

Tt

t

Tt

Tt


Tongue rolling allele is dominant r non tongue rolling allele is recessive r

NOT Pure Breeding

Male = Tt

Female= tt

Male

T

t

Female

Tt

t

tt

t

Tt

tt


Tongue rolling allele is dominant r non tongue rolling allele is recessive r

Punnett Squares are used to determine the probability of an offspring having a particular genotype.

Test Cross & Pure Breeding

Pure Breeding = Homozygous Genotype

In genetics a test cross is used to determine if an individual exhibiting a dominant trait is homozygous or heterozygous (i.e. pure breeding or not)


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