Crossing of a homozygous wild type with a mutant that is heterozygous for a dominant mutation will result in F1 progeny of whichA)all show the mutant phenotype. B)half show the wild-type phenotype and half show the mutant phenotype. C)three-fourths show the wild-type phenotype and one-fourth show the mutant phenotype. D)all show the wild-type phenotype.

Half show the wild-type phenotype and half show the mutant phenotype.

Explanation:

The dominant mutation means that the mutation can express itself even in the heterozygous condition as well. The cross between homozygous unaffected wild type (aa) is crossed with the heterozygous (Aa) is as follows;

Parents   aa    ×       Aa

progeny:  Aa, Aa ( affected ) and aa, aa (unaffected).

Thus, 505 individual are unaffected and 50% individual are affected.

Hence, the correct answer is option (B).

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.