The History of Cystic Fibrosis What is cystic fibrosis? Cystic fibrosis is caused by a mutated gene. A person diagnosed with cystic fibrosis inherits two mutated cf genes, one from each parent. Everyone who has cystic fibrosis was born with it. After birth cystic fibrosis cannot be developed nor can it be contagious.
There are two forms of Tay-Sachs. The most common form develops soon after a baby is born. It causes death early in the child’s life. In order for the child to get Tay- Sachs both of the parents have to be a carrier. If only one parent is a carrier than, this means that the child will have one gene that produces hex A and one that doesn't.
Generation II, child 9 and their mate (10) produced no left-handed children. This confirms that the trait skipped a generation. In generation III, child 2 and their mate (1), produced ¼ of left handed children. This shows that the parents are heterozygous for the trait because ¾ are right-handed and ¼ is left-handed. In conclusion, I learned how to create and understand a pedigree chart when focusing on a specified trait.
This strain of CJD is actually Iatrogenic, which simply means is physician induced. CJD cannot be sterilized off of a serological tool, thus if the tool is ever reused, the disease will be transferred to the new patient. Sporadic CJD is just that, sporadic. The brain-eating proteins, also called prions, can just accidently form from a misprinted protein. Familial CJD would be the genetic variant of this disease, the prions sticking to the parents DNA, thus being passed down to their offspring.
These findings support the biological explanation as it suggests that depression has a genetic factor. However, as all the pairs twins which were used in the study were raised in the same environment, the depression may have been learned or copied from another family member; therefore, this piece of research cannot be seen as valid. Also, this study could be said to lack reliability as it used a small sample size. Furthermore McGuffin et al’s research could be seen as reductionists as they are over simplifying the complexities of depression. In addition to this, some psychologists also argue that the genetic explanation to depression is deterministic as it claims that if an individual’s family members have depression, then they are definitely going to have depression.
When they are given the X chromosome with a mutated gene for hemophilia and are female, they will have one functioning clotting gene and will have little to no manifestations of hemophilia. A male given the mutated X chromosome for hemophilia will only have the mutated gene and will have one of many varying expressions of hemophilia. Based on a percentage range of clotting factors (factor VIII for hemophilia A and factor IX for hemophilia B), a patient can have mild hemophilia (6-50%), moderate hemophilia (1-5%), or severe hemophilia (< 1%). While decreased levels of factors in the clotting cascade do not cause the patient to bleed faster, they do cause prolonged coagulation. It is easy to confuse bleeding disorders with clotting disorders.
This specific karyotype is an example of a man with lesch-nyhan syndrome. Men primarily get the disease because they have only 1 X chromosome that they receive from their mother. If the mother is a carrier of the gene, there is a 50% chance that her son will have the infected gene. Elizabeth: So you’re saying that if I have a boy then there is a chance he won’t have it? Chloe: Yes, but there
Adoption studies go one step further in narrowing down a strong correlational link by ruling out the effect of environment on development of schizophrenia to illustrate the genetic link more clearly. They do this by comparing adopted children to their biological parents to determine links with schizophrenia. Kendler found that first degree relatives of individuals with schizophrenia are 18 times more at risk of developing the condition as the general population. Illustrating the genetic predisposition within families who share genes, strongly supporting the genetic explanation as there is such a high concordance rate. However this study can be criticised because of its retrospective analysis after the disorder had developed, thus it may be more conclusive if a prospective study was conducted to show the ‘before and after’ effects within families.
Answer: C Topic: Concept 14.1 Skill: Knowledge 3) Which of the following statements about Mendel's breeding experiments is correct? A) None of the parental (P) plants were true-breeding. B) All of the F2 progeny showed a phenotype that was intermediate between the two parental (P) phenotypes. C) Half of the F1 progeny had the same phenotype as one of the parental (P) plants, and the other half had the same phenotype as the other parent. D) All of the F1 progeny resembled one of the parental (P) plants, but only some of the F2 progeny did.
Genetics Factor Behind Childhood Schizophrenia This research paper examines the role of genetic and environmental risk factors in the development of childhood schizophrenia. Childhood schizophrenia appears to be a disorder of development that results from a series of neurological insults from fetal life onward. Whether or not schizophrenia manifests in the result of a conglomeration of these factors, both genetic and environmental. Schizophrenia undoubtedly has a genetic component. The risk of inheriting schizophrenia ranges from about 10% for those who have one first-degree family member (mother, father, sister, brother) with the disease to about 40%-65% if the disease affects both parents and an identical twin.