what cross would you use to find out if a tall plant is homozygous or heterozygous
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Assuming that plant height is controlled by one single gene you would have a recessive and dominant allele.

Genotypes

TT (homozygous)

Tt (heterozygous)

tT (heterozygous)

tt (homozygous)

 

Phenotypes

Tall Plant

Short Plant

 

We will assume that tall is dominant and short is recessive.  Tall plants must have the big T allele.  Your genotypes for tall plants would be

Tt - Heterozygous

TT - Homozygous

tT - Heterozygous

 

If you cross two heterozygous tall plants you get the following

 

T

t

T

TT

Tt

t

tt

tt

Crossing two homozygous tall plants would give you

 

T

T

T

TT

TT

T

TT

TT

Crossing 1 homozygous and one heterozygous plants, both tall would give you

 

T

T

T

TT

TT

t

tT

tT

Crossing two homozygous short plants would give you

 

t

t

t

tt

tt

t tt tt

not sure if that answers your question but I hope it helps.

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