Asked Oct 23, 2019

A TT (tall) plant is crossed with a tt (short plant). Create the cross and answer the following questions.

  1. What is the phenotypic ratio?
  2. What is the genotypic ratio?
  3. What % will be tall?
  4. What % will be short?

Expert Answer

Step 1

The branch of biology that deals with the study of genes, heredity and genetic variations are termed as genetics. Every gene contains two alleles for a trait, a dominant allele, and a recessive allele. A dominant allele will be expressed in a person even if only it's one copy is present in the gene, while a recessive allele will be expressed in a person if its two copies are present in the gene for the given trait.

Step 2


Genotype for tall plant = TT

Genotype for small plant = tt

T (tall) – dominant allele for height

t (small) – recessive allele for height

Making a cross between these two plants, we get:


Image Transcriptionclose

Making a cross between these two plants, we get: Parents TT tt Gametes T and T t and Making a Punnett square, we get Gametes т Т Tt Tt (Tall plant) (Tall plant) Tt Tt (Tall plant) (Tall plant)

Step 3

Genotype of all the offspring = Tt

Phenotype of all the offspring = ...


Image Transcriptionclose

Total number of genotypes =1 All the offspring have Tt genotype. Hence, genotypic ratio =1


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