The Hardy-Weinberg theorem states that the frequency of alleles and genotypes in a population’s gene pool remain constant over the generations unless acted upon by agents other than sexual recombination. For example‚ take a population of mice that consists of 1‚000 members. A specific allele‚ albino allele‚ is recessive within this species. 80% of the population expresses the normal phenotype- brown coloring‚ while the remaining 20% are albino. 640 members of the population have the genotype AA‚
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states that the allele and gene frequencies will stay constant from generation to generation as long as no other evolutionary influences come along. The evolutionary influences can be things such as mutation‚ mate choice‚ selection‚ genetic drift‚ gene flow‚ and meiotic drive. Frequency is the proportion of individuals in a certain category relative to the total number of individuals considered. The frequency of an allele or genotype is expressed as a decimal proportion of the total alleles or genotypes
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Discussion: Referring to the hypothesis we predicted in the beginning of this experiment that under ideal conditions‚ we hypothesized that the results will eventually follow the Hardy-Weinberg expectations‚ which means the genotypes frequencies of the Drosophila melanogaster would remain constant; Therefore‚ no evolution had happened to the flies under the ideal conditions. After the chi-squared values were found in each week (table 1)‚ in the third generation where the chi-squared was found to
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reference to the Hardy-Weinberg model. A. Indicate the conditions under which allele frequencies (p and q) remain constant from one generation to the next. B. Calculate‚ showing all work‚ the frequencies of the alleles and frequencies of the genotypes in a population of 100‚000 rabbits of which 25‚000 are white and 75‚000 are agouti. (In rabbits the white color is due to a recessive allele‚ w‚ and agouti is due to a dominant allele‚ W.) C. If the homozygous dominant condition were to become lethal
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Role of Genetics Brenda Dople PSY 104 Child and Adolescent Development Instructor Andrew Fletcher April 16‚ 2012 There are billions of people on this planet. Everyone is different. Even our closest siblings can look‚ behave and have different abilities than we do. Do you ever wonder how this happens? Environmental and biological factors work together in a lifelong process to determine how a child will develop into an adult. In this paper‚ I will discuss how the biological
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Associate Program Material Genetics Worksheet Review the images below and answer the follow-up questions. Each question is worth 20 points. Key: Male affected with cystic fibrosis Unaffected male Female affected with cystic fibrosis Unaffected female Generation I II III IV V Pedigree showing inheritance of cystic fibrosis A Key: Male affected with cystic fibrosis Unaffected male Female affected with cystic fibrosis Unaffected female Generation I II III IV V
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A Study Of Inheritable Traits in Fruit Flies INTRODUCTION The Drosophila melanogaster‚ more commonly known as the fruit fly‚ is a popular species used in genetic experiments. In fact‚ Thomas Hunt Morgan began using Drosophila in the early 1900’s to study genes and their relation to certain chromosomes(Biology 263). Scientists have located over 500 genes on the four chromosomes in the fly. There are many advantages in using Drosophila for these types of studies. Drosophila melanogaster can
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The endocrine system secretes hormones through the blood this takes a varying amount of time to take effect. Hormones carry messages. Certain hormones can affect aspects of the human body at different times. One such time is during puberty. This is the time in an individual’s life that the body changes. Hormones activate behaviors such as aggressiveness and sleepiness (Morris‚Maisto‚ 2005). Mood‚ emotional reactivity‚ learning‚ and resistance to diseases are also attributed to hormones. The thyroid
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The pedigree analysis reveals that the condition affects both sexes‚ is present in all generations and can only be inherited from an affected mother. These features‚ allied to the absence of male transmission to the offspring‚ rule out Y-linked and autosomal inheritances. If it was an X-linked dominant inheritance‚ an affected male would always have affected daughters‚ but II.6 has one unaffected daughter (III.6)‚ so it can be ruled out. The family pedigree seems to have a mitochondrial inheritance
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Albinism is a genetically heterogeneous congenital disorder‚ which causes decreased or absent pigmentation in the hair‚ skin‚ and eyes (O’Neill “Albinism‚ Oculotaneous”). There are two different types‚ which include: oculocutaneous and ocular albinism. Oculocutaneous albinism affects the hair‚ skin‚ and eyes whereas ocular albinism only affects the eyes. In regards to discovery‚ albinism was a known disease for a very long time‚ but it was first recorded and researched by Sir Archibald Edward Garrod
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