Past research has shown increases in the recombination rates due to environmental stressors including age, food availability, behavioral stresses, chemicals and most importantly temperature. This study looks at the effects of an increase in incubation temperature on recombination rates in Drosophila melanogaster. A wildtype parent for three genes (al+ dp+ and b+) was crossed with a recessive parent (al dp b). These genes included presence of aristala, wing type and body color, all found on the second chromosome. The parents were mated and the organisms were divided into two different vials each placed in a different temperature; one in 25°C and the other in 30°C. The offspring were counted based on their phenotype for the three studied traits. It was predicted that there would be an increase …show more content…
The results showed that there was a significant increase in recombination rates between the two traits al and b. This conclusion is supported by past research, which shows that the further away the traits are from each other, the more likely it will be that a crossover occurs between them. Research also showed that any gene near the centromere of the chromosome would more than likely be crossed over. This is the case for the gene for black body (b), which is located near the centromere. Future research may look at the recombination rates among the human genome when exposed to different environmental stressors. Thomas Hunt Morgan, Calvin Bridges and their colleagues have been recognized for their work in discovering recombination frequencies, the chance of a crossover occurring between sister chromatids, and identifying and mapping the location of genes for each chromosome. Their work began in the
Due to the randomness of mutations, poor traits can come back into the gene pool after a number of generations.
79%, were heterozygous. We concluded that it is possible to examine small amounts of DNA by
...G.E., Ioannou P.A., Scheer W.D., Herrera R.J. et al. 1994. Africa origin of human-specific polymorphic Alu insertions. Evolution Vol. 91: pp 12288-12292
The capital B stated the dominate allele which is brown bodies, and the lower case b states black does which is the recessive allele. The capital E stands for red eyes,
-Reilly Philip. Is It In Your Genes. Cold Spring Harbor Laboratory Press. 2004: 223-228. Print
Francis S. Collins is a renowned geneticist who originally became Ph.D in Physical Chemistry at Yale University and later on, a Medical Doctor at University of North Carolina. As soon as he graduated he was offered a fellowship in Human Genetics at Yale University under the guidance of Sherman Weissman, currently Sterling Professor of Genetics. In the late 1980’s Collins became known in the field of Medical Genetics for his development of positional cloning, a technique that allows to locate a hereditary disease-causing gene by studying the inheritance pattern within a family. Working with his method researchers found the genes responsible for diseases like Cystic fibrosis, Huntington’s disease, Neurofibromatosis, Multiple Endocrine Neoplasia type one, and Hutchinson-Gilford Progeria Syndrome. In 1993 Dr. Collins succeeded Dr. James D. Watson as the director of the National Human Genome Research Institute (NHGRI), overseeing the role of the United States in the mapping of the human genome. In 2009 President Obama personally recommended Collins to lead the National Institute of Health (NIH) where he works until present day. Francis S. Collins is by no means a bragging individual, bits and pieces of his accomplishments are scattered throughout the book and he makes no big deal about it; instead he j...
Some individuals have developed different traits to help them in the process of intra-sexual competition. The organisms with more distinctive traits have greater reproductive success. More genes of those traits are then ‘selected’ and are passed onto the offspring of the organisms. Throughout time variability in these traits becomes
We have known for centuries that traits are passed from parents to offspring. What has not always been understood is how traits are determined. One explanation that appealed to scientist for many centuries was that traits of parents were blended, or mixed in offspring. The blending hypothesis accounted for many observable traits and was widely accepted for many years. However, the idea of blending could not account for the appearance of unexpected traits in some offspring. It was not until scientist discovered the cellular basis of life that the inheritance of traits was better understood.
According to biological traits, racial categories are considered to be visible genetic traits which are face structures, shape of the body, and skin color. However, certain differences and
This paper analyzes whether or not gene to map distance in Sordaria fimicola is affected by changes in environmental conditions. The main focus is on how temperature affects the recombination frequency in this organism. It is analyzed if under different environmental conditions wt x gray and wt x tan varies in their percent crossing over. It is investigated how factors such as temperature and ultraviolet light have affected the gene to centromere distance in Sordaria. Results obtained in lab as well as scientific researches prove that as temperatures increases the percent of crossing over increases as well.
The literature does provide evidence for my hypothesis and also provides a clearer picture as to how frequent and to what extent the interbreeding is believed to occur. Examining these articles will introduce the new findin...
The F2 punnett square shows that there should not be a female fly that has apterous wing mutation. Our observed experiment showed that female flies are capable of forming in the F2 Generation. Therefore, the mutation is located on autosomal chromosomes. In trial 1, the p value is not significant. This could be due to the fact that the male to female ratio in the F1 generation was unequal. In trial 2, the p value is significant and likely due to chance. The probability error is between 1 % and 5%.
If they had only recessive genes, there would be no dark eyed, haired or skinned people. This leads to the conclusion that all people have a black ancestor. This is backed up by the well-accepted idea that Africa was the starting place of humanity. As African species travelled north to Europe they made the previous inhabitants extinct.
Gregor Mendel, born as Johann Mendel, is considered to be one of the most significant historic scientist of all time. He was an Austrian scientist and monk and is best known as the “Father of Modern Genetics.” He founded the science of genetics and discovered many things that dealt with heredity that still applies to our world today. He is remembered for paving the way for scientists and future generations to come. Unfortunately, Mendel’s work went unnoticed until 16 years after his death and 34 years after he published his research. Though Mendel lay covered in his grave, his work would eventually be uncovered. Although Mendel was not there to see it,
Marks, John. "RacismEugenics, and the Burdens of History." personal.uncc,edu. Ix International Congress of Human Genetics, 20 Aug 1996. Web. 31 Jan 2014.