Duchenne muscular dystrophy (DMD) is a sex-linked recessive disorder that results in a degenerative disease of the muscles of the body. As muscles gradually deteriorate, patients lose the ability to control the muscles and eventually die as breathing muscles are rendered useless. An extended family was studied over several generations and the incidence of DMD was followed as indicated in the pedigree below.How many generations of family are represented on the pedigree shown?
Answer(s): B
Each level of the pedigree is one generation. John and his wife are the parents of child "B" and another girl, while Jimmy and Janey are the grandchildren of John and his wife, and individuals on the row with "C" and "D" are the great-grandchildren.
A diagram of the cell cycle of the eukaryotic species C. elegans is shown below.During "S" phase of the cell cycle, C elegans cells are:
Answer(s): D
S phase is "synthesis" phase, but not of more ATP than usual. During S phase, cells copy their DNA and organelles in preparation for cell division, which takes place during M phase, or mitosis.
A diagram of the cell cycle of the eukaryotic species C. elegans is shown below.During which of the following phases docs the nuclear membrane of the cell start to break apart so that chromosomes will be able to move to opposite sides of the dividing cell?
It is during the first phase of mitosis, prophase that the nuclear membrane breaks down.
A diagram of the cell cycle of the eukaryotic species C. elegans is shown below.At the very end of mitosis, two daughter cells will be created by a process that pinches one cell in two. This process of pinching is called
Answer(s): A
The pinching off of one cell to create two new cells at the end of mitosis is called cytokinesis.
A diagram of the cell cycle of the eukaryotic species C. elegans is shown below.During all the following phases of the cell cycle, C elegans will have its DN A in a replicated state, EXCEPT:
DNA is copied during S phase, so G1 is the only phase during which DNA is still uncopied.
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