Piz HELP ME ITS BIOLOGY
4) The alleles for a certain gene on the homologous chromosomes (remember, in a homologous pair, one chromosome comes from mom and one from dad), will possibly or certainly be different. Hint: For example, if the gene for eye color is on each homologous chromosome, ask yourself whether the alleles (blue eyes, green eyes, brown eyes, etc.) could possibly be different or would certainly be different for each chromosome.

5) A chromosome with ONE chromatid will make a copy of itself during the S or G1 phase of Interphase.

6) The goal of mitosis or meiosis is to make two exact copies of the cell
8) In prophase I of meiosis or mitosis, the homologous chromosomes come together to make a tetrad.
9) In a tetrad during Prophase 1 or Metaphase I, parts of the homologs (the chromosomes of a homologous pair) switch places in a process called crossing over.

10) There is or is not another interphase before the start of Meiosis 2.

12) In males, the 4 haploid or diploid cells at the end of Meiosis 2 become 4 sperm cells.

the scientific method.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!