In a monohybrid cross of plants with red and white flowered plants, Mendel got only red flowered plants. On self-pollinating these $F_1$ plants got both red and white flowered plants in $3:1$ ratio. Explain the basis of using $RR$ and $rr$  symbols to represent the geno type of plants of parental generation.

In a plant, black seed color $(\mathrm{BB} / \mathrm{BB})$ is dominant over white seed color ($bb$). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

A cross between a homozygous recessive and a heterozygous plant is called

$BB =$ for black colour alleles

$bb =$ for brown colour alleles

Offspring of a cross between a black mouse and brown mouse allowed to interbreed than find out the percentage of black coat in them

If a homozygous red-flowered plant is crossed with a homozygous white-flowered plant, the offspring would be