Question

How many different genotypes can explain a dominant phenotype? How many different genotypes can explain a recessive phenotype? Explain your answer.

Answer 1

ANS : Genotypes and phenotype:-

Genotype refers to the pairs of alleles or It is representation of an individual's genetic constitution with respect to a single character or a set of character.

suppose if we cross the tall pea and dwarf pea ,then three 3 outcomes will occur -TT, Tt ,tt

TT for the pure tall

Tt for the hybrid tall but it is tall

tt for pure dwarf

examples: B -blue eyes and b - green eyes . The three possible genotypes are -- BB , Bb   ,bb genotype has not concerned with expression, only pairing of alleles occur here.

Phenotype refers to the expression of the traits or the observable characteristics of an organisms like sex,colour, height, etc

for example-TT for tall, Tt for tall and tt for dwarf phenotypically

.In phenotype example : two possible phenotype of eye colour --- blue and green because BB and Bb both give the same phenotype i.e blue eyes.

genotype is also used to refers to the pair of alleles present at a single locus. Alleles A and a are there are the three possible genotypes AA, Aa and aa .Gene do not act in isolation.

According to the above example of tall and dwarf pea cross ,only one kind of genotype produce recessive traits i.e tt genotype produce a recessive traits.