One parental organism has the genotype TT, and another has the genotype Tt. What will the genotypes of their gametes be?
Answers
TT X Tt
= TT ,Tt ,TT, Tt
Allele
The alternate form of genes present in an organism responsible for a single character are known as allele.
IN THE ABOVE PROBLEM ALLELE FOR HEIGHT IS TAKEN INTO CONSIDERATION.
Here are the Allele and it's significance for height
- T = Tallness
- t = Dwarfness
On combining the two we get,
- Tt
- TT
- tt
T represents Dominant allel while "t" shows recessive one.
Hence we get the following results.
TT - Tall species
Tt - Tall species
tt - Dwarf species
They are commonly termed as Genotype of a particular plant.
Crossing over
When the crossing over is done that is male plant is crossed with female plants show the following results are obtained :
Let us consider
MALE - Tt
Female - TT
Tt × TT
We get the following genotypes
- Tt
- Tt
- TT
- TT
Means all the species obtained are tall in nature, none of them is dwarf
Hence we obtain the following conclusions :
- Phenotype : All tall
- Genotypic ratio : 1 :1