Meiosis

In order to better understand the cell cycle and the different phases of mitosis, students were expected to observe cell division in an onion root. I hypothesized that we would observe more cells in interphase since most of a cell’s life is spent in interphase. In order to make observations, we used a light microscope to view two slides of an onion root—one had been previously prepared while the other slide was made by each individual student. Furthermore, we then counted how many cells were in…

The Individual differences; what is the difference between sex and gender? How the latter develop? Introduction: In current society it is important to be open and tolerate to be able to understand that in the present life does not appear just sex as man and woman anymore, something new come across called gender. Topic sex and gender is often used, but is it everyone knows the difference? Is it known how to recognise the characteristics features? Today’s society knowns most but still not…

main ideas. It begins with the idea of the variation that exists in a natural species. Variation can come from mutations in a species as well as from the crossing over between homologous chromosomes that occurs in sexual reproduction, specifically meiosis. Both of these factors are important in causing different organisms to develop independently and produce unique offspring. The second idea of natural selection is that more offspring are produced than those able to live to adulthood, meaning…

period with “checkpoints” in between to eliminate unwanted errors that occur during that time span. In addition, it focuses on Genetic recombination, a process in which results from the “exchange of genes between paired homologous chromosomes during meiosis” and rearranges DNA sequence to give different expressions and functions of certain genes (Cooper). In addition, it also can occur between related organisms and their chromosomes, which means that the overall arrangement does not get vastly…

Artificial insemination is a cell fusion from outside the body. It requires fertilization but not mating and is when sperm is collected from the male and inserted into the female’s vagina for fertilization to occur. This procedure of Insemination increases the chance that the sperm will fertilize an egg. It is advantageous in situations where it is costly or difficult to bring the male or female together of if natural conception cannot happen. For example, sperm can be collected from a good,…

with ribosomes and proteins that allow other molecules to enter. The DNA located in the nucleus is formed into structures called chromosomes, as opposed to the circular DNA in prokaryotic cells. This structure allows it to go through the process of meiosis. Also located in the nucleus is the nucleolus. Inside the nucleolus are ribosomes. They are responsible for making the proteins necessary to the…

Evolution- Process of Biological Change Evolution is the process, through natural selection, that organisms are thought to have changed from earlier organisms into new and more complex forms over time. These evolutions suit their new environments and needs (Levine & Miller). The origins of this theory began with Charles Darwin. Darwin first explained that evolution occurred because of natural selection, or survival of the fittest. In which, the strongest and most fit organism survives and passes…

The Evolution Canyon is a particularly special place for observing how a specific species may change overtime, in two different environments. Evolution Canyon I, located in Lower Nahal Oren, Mount Carmel, has two slopes; a South Facing Slope, which receives higher solar radiation, higher temperature, and experiences droughts, and a North Facing Slope, which shows a more temperate climate, with shade and humidity engulfing its physical atmosphere (Nevo, 2009). The fungus Sordaria fimicola can be…

Flowers, produce by the sporophyte, function in sexual reproduction The four floral organs are sepals, petals, stamens, and carpel. Sepals protect the floral bud. Petals help attract pollinators. Stamens bear anthers in which haploid microspores develop into pollen grains containing male gametophytes. Carpel contains ovules (immature seeds) in their swollen bases. Within the ovules, embryos sacs (female’s gametophytes) develop from megaspore. Pollination which precedes fertilization is the…

Evaluation Strategy Student Learning The Next Generation Science Standards which are endorsed by the National Science Teachers Association proposes that students should be taught to analyze and interpret data, be able to provide evidence that plants and animals have traits inherited from parents, and that variations of these traits exist in other organisms. This unit’s purpose is to make students aware of the concepts of genetics and inheritance and other related concepts. Students will learn…