When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is

Which one of the following is not a mutagen

The most likely reason for the development of resistance against pesticides in insects damaging a crop is

Sex linked inheritance was discovered by

Polytene chromosomes in salivary glands of are formed as a result of

The recessive gene that always produces its effect, is