The food additives that inhibit the growth of the pathogen clostridium botulinum are

The food additives that inhibit the growth of the pathogen Clostridium botulinum are nitrites. Nitrites are regarded as effective growth inhibitors for Clostridium botulinum and thereby they prevent botulism. By inhibiting its growth nitrite disable production of the lethal toxin, so it often added to a food such as canned meat.

If the parents are homozygous and have different colors such as black (recessive) and white (dominant) then the offspring will have the color of the dominant allele.

According to Mendel's laws there are two types of alleles, dominant and recessive, when the parents are dominant homozygous they have an AA genotype and if they are recessive homozygous they have an aa genotype, when reproducing all their offspring they will have an Aa genotype and only the allele will be expressed dominant, in this case white.