In swine, when a pure-breeding red is crossed to a pure-breeding white, the f1 are all red. however, the f2 shows 9/16 red, 1/16 white, and 6/16 as a new color, sandy. a particular red individual (parent 1) is crossed to a particular sandy individual (parent 2), and the progeny is comprised of four sandy, three red, and one white piglets. what are the most likely genotypes of the two parents?

Parent 1 : AaBb

Parent 2: aaBb or Aabb

Explanation:

In this cross two genes are involved and they are duplicate genes with cumulative effect i.e. individually they show the same phenotype but when together, they produce a new phenotype. Here,

A_B_ = red

aaB_ = sandy

A_bb = sandy

aabb = white

The progeny in question has a white piglet (aabb) so it must have got a set of "ab" gametes from both parents. Since parent 1 has red phenotype it should also have one A and B allele. Hence its genotype is AaBb.

Parent 2 should also contribute an "ab" pair to white piglet and it has sandy colour which is produced by either an A allele or a B allele so its genotype should be Aabb or aaBb.

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.