During the cortical reaction, during the cortical reaction, enzymes are released from the head of the sperm enzymes are released from vesicles in the oocyte the zona pellucida disappears multiple sperm fertilize the egg

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm