Agnes Simons
PCB3063L
February 26, 2018
Questions
1. What kind of evidence would indicate that the ability to taste PTC is inherited?
That number, or rather percentage, of children that can or can not taste PTC correlates with their parent’s results. In case where both parents can taste- most of the kids also can taste, percentage of kids which can taste is lower in a combination where one parent can taste and other cannot and if parents cannot taste it then there is no way that children can taste it.
2. Why was it important for Snyder to verify that males and females had similar proportions of tasters and non- tasters?
So he can prove that genes responsible for this phenotype is located on autosomal chromosomes and not x or y chromosome. Location of loci responsible for this ability is important and there is a difference between loci being located on sex and autosomal chromosomes. If loci was to be located, for example, on X chromosome, patterns in which this ability is inherited would be different. In that case, females are more likely to have the ability to taste PTC since they have two X chromosome and chances are twice bigger that dominant allele is present. If no female children had this ability, that would mean that it is located on Y chromosome.
3.
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Why do couples who can taste PTC have children who cannot?
Because this phenotype is inherited by completely dominant allele, so for this allele to be expressed it is enough that there is only one copy. This also makes it possible for recessive allele to be inherited without being expressed. If a child has parents who both have heterozygote genotype than it is possible that childe inherits two recessive alleles, so kids whose parents could taste PTC do not have this
He supports the claim first by thoroughly discussing a number of old experimental attempts to prove the superiority of the male brain to inform the reader of outdated scientific claims, then by explaining the poor experimentation and misinterpretation of these experiments to discredit the claims of Broca, and finally by addressing the social issue at the heart of these experiments using his personal opinion to make the audience accept his opinion based on his display
The main hallmark of an autosomal recessive trait is that both men and women have an equal chance in acquiring the trait.
Y-linked genes typically determine sexual orientation, whereas X-linked genes typically determine an abundance of other traits because it’s much bigger than the Y-chromosome. Males are hemizygous because they lack a second copy of an X chromosome (XY), unlike women who have 2 (XX). This is why its much more common for a man to inherit an X-linked recessive disorder because they don’t have a second X chromosome to compensate. However, women can still express these traits and also be carriers if they are homozygous for the allele. A Barr body forms from the inactive X that
The two recessive alleles are both on the same chromosome. Genes A and B completely follow Mendel’s principles of inheritance; genes B and C are physically connected together and never are separated from each other at any time during any cell division cycle or fertilization event. Draw below the gamete genotypes that this individual could produce.
The genotype - - in the PV92 locus could indeed have a positive affect and favored over ++ or +-. If an individual has the + allele they at least, have one ALu site. This site is a location where many mutations can appear and cause diseases or other defects (Lev-Maor,2003). For the TAS2R38 loci, being a test could have an advantage compared to non-tasters. The taste of PTC is a bitter sour taste like many acids and chemicals. This could help the survival of individuals due to their ability to taste this chemical; it could aid in protect from other bitter taste that may be harmful (Wooding,
The main hallmark of an autosomal recessive trait is that both men and women have an equal chance in acquiring the trait.
While “Blackwell focused primarily on women's differences from men, Jacobi spoke much more often of men's and women's characteristics” 3. The biomedical concepts would evolve because both doctors and scientists would begin to study diseases which were sex-linked as well as studying chromosomes and hormones. As medicine progressed themedical community began to “recognize that categories treated as biological are in fact largely
Taste aversion therapy is where an aversive stimulus is associated with an unwanted behaviour to therefore extinguish it. One of its primary principles is that all types of behaviour is learned and therefore any undesirable behaviour can be unlearned, with the appropriate method (Aversion Therapy, 2014). The experiment produced by Dale S. Cannon, Antonio Gino, Timothy B. Baker and Peter E. Nathan (1986), evaluated the relationship between the strength of the taste aversion and the abstinence rate. Following on, the study founded by James W. Smith and P. Joseph Frawley (1990), determined the alcohol abstinence rates for patients treated for the first time. Furthermore, the study conducted by Matthew Owen Howard (2001) assessed the extent to which pharmacological aversion therapy (PAT) assists in a conditioned aversion to alcohol. All three studies coincide to evaluate if taste aversion therapy for alcoholism produces behavioural change.
The main hallmark of an autosomal recessive trait is that both men and women have an equal chance in acquiring the trait.
Possible flaws in this experiment might’ve included not having an equal amount of children to adults, testers seeing which brands were which on the labeled boxes, or maybe not having exactly equal amounts of food in each test cup.
Most pediatricians report that the drug's bitter taste is one of the biggest problems for completing a treatment. Pills are usually bitter instead of sweet so children won’t eat it. Some drugs as pills are bitter but sweeter as a liquid, and because liquids stays in your mouth longer than pills, it’s made sweeter. The bitter taste happens from stimulating the receptors in your tongue and It signals the brain to identify that the pill is bitter. Children are more bitter-sensitive than adults so they can taste it more.
* Most people doing the experiment had different physical levels of fitness, and it might have been more relevant to the gender issue if everyone had more or less the same level of fitness.
Then every student in the class had to put a PTC tasting strip on the tip of their tongue to test a
When the inheritance pattern is autosomal dominant, it means that one parent was affected and that one copy of the mutant gene will cause the disease. About 15-20% of RP cases are autosomal dominant (Chang, et al., 2011). On the other hand there is also the autosomal recessive inheritance. It takes two copies of the mutant genes to cause the disease. If both parents are carriers, there is a 1 in 4 chance of their child having RP, 1 in 2 chance that their child is a carrier, and a 1 in 4 chance that their child is not affected at all. In the case of a X-linked inheritance, male offspring are more susceptible to having the disease compared to female offspring who will most likely be carriers. However, about 40-50% of RP cases have been linked to unknown inheritance patterns (Chang, et al., 2011; Nash, et al.,
Taste buds are sensory organisms that are found on your tongue. They allow you to experience tastes that are sweet, salty, sour and bitter. The bumps that are located on your tongue is called papillae, which contain taste buds. Taste buds have extremely sensitive microscopic hairs called microvilli. Microvilli send messages to the brain about how something tastes, so you can tell if something is sweet, salty, sour, or bitter. The average person has around 10,000 taste buds, and they are replaced every two weeks or so. As a person ages, those taste smells do not get replaced so, an older person might have only 5,000 working taste buds(The Nemours Foundation, 2015). Smoking also can reduce the number of taste buds (Greene, 2011).