The expression of only one of the parental characters in a monohybrid cross in the F₁, the expression of both in the F₂ and the proportion of 3:1 obtained at the F₂ can be explained by:
1. Law of Dominance
2. Law of segregation
3. Law of Independent Assortment
4. Two-factor interaction

When there is a change in the chromosome number such that the changes number is not an exact multiple of base number [haploid number], the condition is called as:

Mutations that arise due to changes in a single base pair of DNA are called as:

When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F₁ progeny, the F₂ ratio deviated very significantly from the 9:3:3:1 ratio. This can be attributed to the fact that:

The number of alleles, the genotypic combinations, and phenotypes in the ABO system are respectively:

Thalassemia is inherited as a/an ____________ condition.

A test cross is done to find out:

The F₂ genotypic ratio of a monohybrid cross is:

In humans, the condition red-green color blindness is a sex-linked recessive trait. In a family pedigree analysis, you find that two people with normal color vision have a color-blind son. This is possible if the genotypes of the parents are:

A woman has four daughters. The chance that her next child will be a son is: