During the first cycle of replication in meiosis, Prophase is the same but crossing over occurs along side of the nuclear membrane dissolving, chromosomes developing, and the spindle fibers forming. Crossing over is the process in which homologous chromosomes from both parents pair up and exchange DNA. Also during metaphase and anaphase homologous chromosomes are separated and pulled to opposite sides. During this second cycle of replication the cells grows through Prophase II, Metaphase II, Anaphase II, Telophase II, and its final cycle of cytokinesis which is the exact same as during mitosis. I will play a quick review of this process.
a. The majority of the people diagnosed with Down Syndrome have it because of a faulty cell division called nondisjunction i. Nondisjunction happens with one of the pairs of the chromosomes fail to separate, resulting in the three 21 chromosomes ii. Total number of chromosomes equals 47 b. According to …. 3-4% of Children with Down Syndrome get it through gene translocation i. Gene translocation happens during cell division. This happens when part of the chromosome 21 breaks off and attaches to another
Extra autosomes and extra or missing sex chromosomes relate to errors in meiosis because they are the result of chromosomes failing to properly separate in meiosis. Deletions, duplications, inversions, and translocations relate to an error in meiosis because they are a consequence of homologous chromosomes failing to align correctly in meiosis or result from errors when crossing over occurs. 8. Could nondisjunction occur during mitosis? Compare and contrast the likely consequence of nondisjunction in mitosis vs.
Camryn Whitley Anatomy Mr. Hunter December 12, 2014 Background information of Triple X Syndrome After every baby is born, people compare his or hers features to the parents. The baby has his mother’s blue eyes or the baby inherited his height from his father. All these examples could be true but people do not understand how the gene pool works.
Based on the observations collected over the three species, interphase is by far the longest phase, and metaphase, anaphase, and telophase are similar in length, with telophase being slightly shorter. In the broad bean, almost all of the cells were in interphase, for reasons stated in the previous question. In the onion root, about 3/4 of the cells were in interphase, with most of the rest in prophase, and a few in metaphase, anaphase, and telophase. The whitefish had about 70% in interphase, with most of the rest in prophase (15%) , and more in metaphase than in the previous species (6%). The whitefish could have had more cells in metaphase because being animal cells, they require the centrosomes to align at opposite poles, which may cause it to take longer.
During random fertilization, no gamete has a greater chance than the other with fusing together in sperm and zygote fusion. These processes contribute to the production of genetic variety because of the many opportunities of unique combinations, unlike the process of mitosis, in which identical daughter cells are always the
I observed a four year old girl that was tiny for her age. She worked on proprioceptive and vestibular input like the other children. One major difference is that her condition has not been diagnosed. The doctor suspect a chromosome issue, but her family has not gone for additional testing. Although she can recognize shapes, colors, and letters, she is still delayed.
Sexual reproduction is most common type of reproduction among the plants and animals. They are of following types; 1) Syngamy: The fusion of gametes takes place completely, if male and female gametes are produced by same cell or organism and both gametes fuse together to form a zygote, this is called as Autogamy, paramecium is its example. Another is Anisogamy in which some organisms produce two types of gametes. Both types of gametes differ from each other in their shape and size and are known as an isogametes or heterogametes. Male gametes are motile and small in size and are known as micro gametes.
The film briefly examines different services that are available for the families. However, the film demonstrated that the most precious resource is the role of parents and caregivers to believe in their child and never limit their abilities. Down syndrome has specific characteristics that are unique to this exceptionality. The most shared features associated with Down syndrome that were evident in the children in this film include; Flat facial features, with a small nose, Upward slant to the eyes, Small skin folds on the inner corner of the eyes and an Enlarged tongue. My major is Communication Disorders
What is the Microsporidia life cycle? 1. The spore infuses the infective protoplasm into the eukaryotic host cell through the polar tubule. 2.At the point when the spores increment in number and totally fill the host cell cytoplasm, the cell film is disturbed and discharges the spores to the environment. There are many places that Microsporidia can be found in.
Every cell in the human body has a nucleus, where genetic material is stored in genes. Genes carry codes responsible for our inherited traits. Typically, the nucleus of each cell contains 23 pairs of chromosomes. Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. I could continue talking about this, but since this isn’t science class, thank God, and I’m obviously not a science teacher, I’m just going to leave it here.