Argumentative research topics are topics that are designed to spark a debate or argument, and they are a great way to stimulate critical thinking and to get people talking about important issues. If you are looking for ideas for argumentative research topics, here are some suggestions:
The legalization of marijuana: This is a hot topic that has been debated for many years. Some argue that marijuana has medicinal benefits and should be legalized for this reason, while others argue that it is a gateway drug and should remain illegal.
Climate change: This is a highly controversial topic that has been in the news a lot recently. Some argue that climate change is a real and urgent threat that needs to be addressed, while others argue that it is not a significant problem.
The death penalty: This is another topic that has been debated for many years. Some argue that the death penalty is a necessary deterrent for crime, while others argue that it is a cruel and inhumane punishment that should be abolished.
Gun control: This is another hot topic that has been in the news a lot recently. Some argue that stricter gun control laws are necessary to reduce gun violence, while others argue that gun control infringes on their Second Amendment rights.
Abortion: This is a topic that has been highly debated for many years. Some argue that abortion should be legal and accessible to all women, while others argue that it is a moral wrong and should be banned.
These are just a few examples of argumentative research topics, and there are many more that could be explored. No matter what topic you choose, it is important to do your research and be well-informed about the issue before you begin writing your argumentative essay.
Polygenic Inheritance
Who is considered the father of polygenic inheritance? The recessive alleles a, b, and c control light color pigmentation. The genotype sets the range for a quantitative trait, but the environmental conditions decide the phenotype within its genetic limits. For gene 2, the dark hue G is dominant and produces a green color. One of the traits exhibited by polygenic inheritance is incomplete dominance. The skin colour of an individual is due to the presence of a pigment called melanin.
Source: Maria Victoria Gonzaga of B. Accordingly, under different environmental conditions, the gene function may switch OFF or switch ON. It is also another example, whose expression is controlled by 5 genes. A polygenic trait can be described as a trait that is regulated by numerous genes and not just one gene, and each of these genes will have numerous alleles. These are the variations that are produced due to the average effects of genes that are present on different loci.
For instance, if long hair on guinea pigs was dominant, then short hair would be recessive; and the guinea pig would either just have long or short hair. Consider a pair of three distinct alleles present at unlinked loci, A and a, B and b, and C and c, to better understand the inheritance pattern of skin colour. Individuals who inherit no dark alleles will have very light skin color, while those that inherit only dark alleles will have very dark skin color. The polygenic inheritance genes known as polygenes, along with the other genes, have little influence on a phenotype. This trait is controlled by two major genes and fourteen additional genes linked to the X-chromosome. A cross between heterozygotes for both genes BbEe x BbEe would generate offspring with a phenotypic ratio of 9 black: 3 chocolate: 4 yellow.
Which of the following is an example of Polygenic Inheritance? Traits or characteristics like height, skin pigmentation, eye color, wheat kernel color, etc. The appearance of each of these traits is due to interactions between two or more genes. It is likely that our exact eye color is the result of multiple genes or polygenic where some alleles are dominant, some are codominant, some are additive, and others show other patterns of inheritance, allowing people to have a spectrum of eye colors. The definition of polygenic inheritance is also related to the number of genes. This is the most commonly exploited variability utilized by plant breeders for carrying out Here, it is important to understand the meaning of additive variance. This is a modification of the typical dihybrid Mendelian ratio of 9:3:3:1, in which three of the progeny groups all have the same phenotype.
The additive impact means every contributive gene produces one unit of color. Human height Human height is a polygenic trait that is controlled by three genes that have six alleles. Phenotypic expression is dependent on both nature and nurture. The alleles in this control the pigment that controls the skin color, which is called melanin. Different combinations of these alleles result in a variety of eye colors.
Polygenic inheritance: definition, characteristics, examples and influencing factors (2022)
For instance, the height of an adult human is determined by not just a single gene but by more than 400 genes apart from the other non-genetic factors such as 2. Genes exhibit an additive effect Genes exhibit a non-additive effect Continuous variations Discontinuous variations Segregation of individuals into classes is not possible Segregation of individuals into classes is possible Environmental factors influence them Not influenced by the environmental factors Mean, variance and covariance are the statistical parameters used for the population evaluation Ratios and frequencies are the statistical parameters used for the population evaluation Segmentation of Polygenic Variability Variance is used to segregate the polygenic variation or variability present in a genetic population. It is controlled by around 60 loci. Another example of how environment can affect phenotype is an inherited condition called phenylketonuria PKU. Polygenic Inheritance Definition In simple words, polygenic inheritance refers to a character or phenotypic characteristic that is controlled by multiple genes. Reply:Joseph Gottlieb Kolleuter is known as the father of polygenic inheritance.
To understand the inheritance pattern of skin color let us consider an example of pair of three different alleles present at unlinked loci represented as A and a, B and b, C and c. Multiple genes exert the same effect. At least for this lesson, there are only two genes. Internal or inherent characteristics are also influenced by the environment. Parents having genotype AABBCC and aabbcc will produce offspring of intermediate colour in the F 1 generation, i. ABO blood type is an example of multiple allelism, where a single gene has three different alleles or variants in the same locus and an individual contains any of the two alleles. The effect of individual genes is too minor and remains undetected.
Some examples of polygenic inheritance are: human skin and eye color; height, weight and inteligence in people; and kernel color of wheat. The three recognized colors of this breed of dog are black, chocolate and yellow. This is also referred to as the theory of polygeny for evolution. Fig: Polygenic Inheritance of wheat kernel colour by using Punnett square in the F 2 generation B. These alleles crossed in the F 1 generation produce intermediated red color have Aa Bb Cc. Polygenic inheritance in plants Examples of this type of inheritance are flower shape and color, stems, pollen, seed size, yield, oil content, maturity or flowering time, etc.
It is different from multiple alleles because, in multiple alleles, three or more alleles are present on the same locus, out of which only two alleles are present in an organism. It is greatly influenced by environmental factors. In polygenic inheritance, continuous variation is observed in the phenotype of a trait. FAQs on Polygenic Inheritance Q. Most of the polygenic inheritance follow the normal distribution curve, wherein the majority of the people fall in the middle range of the curve. Many traits and phenotypic characters are inherited by many alleles present in different loci, known as polygenic inheritance.
