In morgan's testcross of a gray-bodied, long-winged heterozygous female drosophila with a homozygous recessive black-bodied, vestigial-winged male, the following offspring were obtained:
1) 965 gray body,
2) long wing;
3) 944 black body,
4) vestigial wing;
5) 206 gray body,
6) vestigial wing;
7) 185 black body,
8) long wing.
9) focusing only on the recombinant classes (gray body, vestigial wing and black body, long wing),
10) the numbers of offspring of each type are similar (206 and 185).
what accounts for the similar number of offspring of each recombinant phenotype?

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?

Producing disposable grocery bags consumes resources. recycling disposable bags is a solution that can recover some of the resources used to make new bags. which of the following behaviors could further refine the solution? a. disposing of bags by burning them b. reusing bags whenever possible c. using bags at once so that they do not break d. using only nonrenewable materials to make new bags subject is environmental science for apex users

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.