To determine the heterozygosity of an organism,one has to perform:

Consider the following four statements $I, II, III$ and $IV$ and select the correct statement:
$I.$ Mendelian experiments have a large sampling size, which gave greater credibility to the data that he collected.
$II.$ Recessive allele influences the appearance of the phenotype even in the presence of a dominant allele.
$III.$ Mendel analysed qualitative characters in garden pea.
$IV.$ In $F_2$-generation of a Mendelian monohybrid cross, the tall and dwarf traits were identical to their parental types and show no blending inheritance.

Describe test cross. Why is it necessary?

Which of the following traits was dominant in the garden pea studied by Mendel?

In a monohybrid cross, when $F_1$ is crossed with a homozygous dominant parent, what type of offspring will be obtained?

The genotype of a plant showing the dominant phenotype can be determined by