Label the following diagrams.

Answer (far right) just needs an explanation**

If a parent cell of a sexually-reproducing species has 28 chromosomes, the number of chromosomes in the zygote would be 14.    28.    56.    112.    impossible to determine with the information given.   A tetrad is composed of       two chromosomes with two sister chromatids each.       two sister chromatids with separate centromeres.     four chromosomes with two sister chromatids each.     four sister chromatids are attached at a common centromere.      QUESTION 3 During crossing-over     genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.     genetic material is exchanged between non-sister chromatids, resulting in new combinations of alleles.     sister chromatids from each homologous chromosomes of a tetrad are exchanged, resulting in new combination of alleles.     one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations…

meiosis is a type of cell division only required in organisms that reproduce sexually.  Explain why meiosis is needed (instead of mitosis) for sexual reproduction, and describe one possible advantage of reproducing sexually instead of just copying cells.

Give the  Haploid Number of Chromosomes for a Varietyof Organisms (see below)  Common Name                                    Scientific Name Pink bread mold                                      Neurospora crassa

Which of the following are differences between mitosis and meiosis I? CHOOSE ALL THAT APPLY. A) Crossing over occurs during meiosis I but not during mitosis B) DNA replication takes place prior to mitosis, but not before meiosis I C) Sister chromatids separate in mitosis, and homologs separate in meiosis I D) Only meiosis I results in daughter cells that contain identical genetic information E) Meiosis I results in two daughter cells, while mitosis results in four daughter cells

The Na"/glucose symport transports glucose from the lumen of the small in- testine into cells lining the lumen. Transport of 1 glucose molecule is directly coupled to the transport of 1 Na* ion into the cell. 1 Na"out + 1 glucose,ut→1 Na¨m+1 glucose. Assume the following conditions at 37 °C: [Na"Jm = 12 mM, [Na"Jout =145 mM, [glucose]out =28 µM, and A =-72 mV (inside negative). (a) What is AG for transport of Na* from outside to inside under these conditions? (b) What is the upper limit for [glucose], under these conditions? (c) Which of the two hypothetical symports shown below (A or B) would achieve the highest concentration of [glucose]n under the conditions described above? Briefly explain your choice. A: 1 Na"out +2 glucoseut + 1 Na" in +2 glucosen B: 2 Na 1+1 glucoseut → 2 Na in +1 glucosen out

The amount of DNA in a differentiating oligodendrocyte in M-phase is 210pg. How much DNA would be present in Go? Briefly describe the expected cellular function during this stage How much DNA would be present in G₂? Briefly describe the expected cellular function during this stage. What is the number of chromosomes during gametogenesis if you have eight chromosomes at Meiosis I? What is the amount of DNA in a spermatozoa cell? a. 1x b. 0.5X C. 2X d. 0.25X 688 words IX English (United States) Focus. E

Fill in the blanks. The parentheses represent choices for each blank. During human fertilization, ________ (two male gametes, two female gametes, a male gamete and a female gamete) fuse to produce a __________ (male germ cell, female germ cell, zygote).

Sperm need significant amounts of ATP to fuel their travel through the reproductive tract. This ATP is generated via oxidative metabolism of the glucose and fructose contained in the seminal fluid.     These sugars are large polar molecules that enter sperm cells via glucose transporters or GLUTS.  One such GLUT protein is depicted in the image below.  When GLUTS recognize and bind glucose, they undergo a conformational change releasing glucose on the other side of the membrane. Due to the persistent high energy demands of the sperm cell, these sugars are continually being catabolized (broken down).  GLUTs mediate what type of transport of glucose and fructose across the membrane? ________________  Is this an active or passive process? _________________        What type of transport protein are the GLUTs described in this question? ___________________    How many transmembrane domains does this GLUT have?  _______________