To produce pea plants that only display the recessive phenotype of a trait, what must be the genotypes of the parent plants? a. both must be tt b. both must be tt c. tt and tt d. tt and tt

The correct answer is option B. "both must be tt".

Explanation:

The recessive phenotype of a plant could only be expressed if the two recessive alleles of the gene are present in its genotype. In order to produce pea plants that only have two recessive alleles (tt) both parent plants must be tt. The presence of the dominant phenotype (TT or Tt) in any of the parent plants, would make very likely to have at least one plant, or all of them, with the dominant phenotype.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.