what is the advantage to having one promoter and one operator associated with three structural genes that produce lactose metabolizing enzymes?

Plants that have reproductive structures called cones are?

Explain why the plants cortex would serve as the best food source for animals

In tomato plants, mendel found that the allele for smooth seeds (s) is dominant, while the allele for wrinkled seeds (s) is recessive. which of these punnett squares shows crosses between two plants heterozygous for smooth seeds? i need this to be answered as soon as ! sry the picture is bad quality