The ratio $1:1:1:1$ is observed in:

In a dihybrid cross,out of $16$ plants obtained in the $F_2$ generation,the number of distinct genotypes is:

In a dihybrid cross,when $F_1$ plants $(RrYy)$ are self-hybridized,what is the segregation ratio of yellow and green seeds in the $F_2$ generation?

$A$ pure breeding pea plant with round yellow seeds was crossed with a pea plant having wrinkled green seeds. On selfing of the $F_1$ hybrid of this cross,$64$ progenies were obtained in the $F_2$ generation. Find out the number of $F_2$ progenies showing non-parental characters.

Pure homozygous offsprings in a dihybrid cross in the $F_2$ generation will be

In a typical Mendelian dihybrid cross,one parent is homozygous for both dominant traits and another parent is homozygous for both recessive traits. In the $F_2$ generation,both parental combinations and recombinations appear. The phenotypic ratio of parental combinations to recombinations is