BIOL308 Lecture Notes - Intron, Ribosomal Rna, Peptide
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1- Most of a cell's life is spend in this phase of the cell cycle:
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2- The cell cycle is a highly regulated process.
True
False
3- Cells replicate their DNA during ________________ phase.
G
S
Q
M
4- In animal cells, ________________________ is the indentation of the cell's surface that marks cytokinesis, the final splitting of the membrane, in the process of cell division.
cleavage furrow
binary fission
cell plate
sister chromatids
5- Somatic ("body") cells are _______________ (2n). This means there are two copies of each chromosome.
6- During the _______ phase(s) cells perform their everyday functions.
S
M
Q
G
7- When chromosomes are duplicated the two strands are called _______________________________ and they are linked together at a point called the ____________________.
sister strands; kinetochore
sister chromatids; centromere
dual chromatids; centromere
genes; chromatid
8- New somatic âbodyâ cells are formed by this process:
meiosis
binary fission
replication
mitosis
9- The cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.
10- Cells replicate their DNA during ________________ phase.
S
Q
G
M
I'll be thankful if someone can help me to do this!
According to this:
Read the following New York Times article and then answer the questions below and then answer the questions New Clues to Sex Anomalies in How Y Chromosomes Are Copied
http://www.nytimes.com/2009/09/15/science/15chrom.html?scp=1&sq=sex%20anomalies&st=cse
This activity contains 5 questions.
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You must make 2 reflective, thoughtful, deep, constructive critiques of your class mates posts. as part of a threaded discussion following their initial post. The critiques must not about you, but about science!
Here's the first peson. Needs to reply for some of her answers as it says above.
1. When discarding bad genes, the Y chromosomes recombines with itself.
2. The centromere functions to hold a pair of copied chromosomes together.
3. A person with Turnerâs syndrome is born with a single X chromosome.
4. The male-determining gene on the Y chromosome is located close to the end of the left arm.
5. An individual can have some cells with no Y chromosomes and other cells with double Y chromosomes, due to the differing variants present in regards to the genotypes of the cells in a single individual. When the Y chromosome is compared to other chromosomes such as the X chromosome, mutations and deviation in the distance of the centromere are much more prevalent due to the Y chromosome lacking a backup system to promote repairs.1 (Links to an external site.) Even if a mutation caused a condition such as the XYY syndrome where two Y chromosomes are present, that mutation and genotype would not be present in every single cell of the individual.2 (Links to an external site.) The presence of different genotypes offers an tentative explanation to as why a single individual can have some cells with no Y chromosomes while also housing other cells with double Y chromosomes.
Source 1 http://www.nytimes.com/2009/09/15/science/15chrom.html
Source 2 https://www.healthline.com/health/xyy-syndrome
Here's the second person. Needs to do the same as it says above.
1. Itself
2. Centromere
3. A single X chromosome
4. Close to the end of the left arm
5. Briefly explain how an individual can have some cells with no Y chromosome and other cells with a double-Y chromosome.
In some cases, the Y chromosome reaches over to a neighboring counterpart and the two chromosomes fuse. This results in the loss of part of the chromosome. Jacobâs Syndrome is sometimes also called XYY syndrome because the person has two Y chromosomes. Although a person can survive with this genetic mutation, some physical traits may be observed such as taller than average height, weak muscle development or late speech development.
Source 1 https://www.healthline.com/health/xyy-syndrome
Source 2 http://www.isna.org/faq/y_chromosome