GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
homozygous dominant
|
|
|
homozygous recessive
|
|
|
heterozygous
|
|
|
none of these
|
Detailed explanation-1: -Heterozygous tall (Tt) is crossed with homozygous tall (tt) to determine the dominant and recessive trait. Note: For example, The dominant trait of eye color is brown. It is represented by BB.
Detailed explanation-2: -The notation tt means the homozygous condition, wherein the homologous pair contains same alleles of a gene. Alleles are different forms of one gene.
Detailed explanation-3: -When cross takes place between Tt and tt two different types of alleles are form, Tt X tt = Tt, Tt, tt, and tt. The genotypic ratio for this cross is 1:1 and the phenotypic ratio is 1:1, where Tt is heterozygous dominant and tt is heterozygous recessive. This type of cross is a test cross.
Detailed explanation-4: -A pure tall (TT)plant is crossed with a pure short (tt) plant. The first generation will be tall (Tt) and it is a hybrid plant.
Detailed explanation-5: -So, the correct option is ‘50%’.