All of the following are effects of crossing over of homologous chromosomes during prophase i of meiosis with the exception of a) increased genetic variety. b) increased number of chromosomes in the offspring. c) the appearance of new phenotypes in the offspring. d) possible harmful mutations from cross-over errors.

Answer;

B) increased number of chromosomes in the offspring.

Explanation;

-Cross over is a process that takes place during meiosis. It occurs when homologous chromosomes pair up and the segments of chromosomes are exchanged between non sister chromatids, resulting to recombinant chromosomes.

-The process causes genetic variation among organisms due to exchange of genetic material. In addition to increased genetic variation, cross over may results to the appearance of new phenotypes in the offspring. Also cros-over mutations may cause harmful mutations.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?