Introduction to Biology - C190 Unit 6 Test

Introduction to Biology - C190 Unit 6 Test Leave the first rating Students also studied Terms in this set (14) Western Governors UniversityC 190 Save C190 Introduction to Biology Unit 7 ...10 terms Kali_MetzgerPreview Unit 7

• terms

StudyReviews101 Preview WGU C190 Intro to Biology 311 terms ellen_nicole_allen Preview

UNIT TE

11 terms Tab Which statement explains what Down syndrome is? This is a condition in which the child has an extra chromosome.Explain to the couple the cause of Down syndrome. Down syndrome is the result of errors in meiosis when the egg is produced.Huntington disease is aphenotype What is a phenotype?the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.What is a genotype?the genetic constitution of an individual organism.A person with Huntington disease always has at least a 50% chance of passing the disease on to his or her offspring. The other partner does not need to have the disease allele in order for the child to develop it. The trait is equally common in males and females. An individual either has or does not have the trait. There is no intermediate phenotype.What is the inheritance pattern of Huntington disease?Autosomal dominant A patient's brother was tested for Huntington disease and the results were negative (the brother would not develop Huntington disease). The patient wants to know the probability that she will have the disease.What is the chance that the patient has inherited the Huntington allele?50%

The same patient has not been tested herself but wants to know the chance that her children will have the disease. Her partner does not have a history of the disease in his family.Assuming that neither parent of the patient's partner carries the disease allele, what is the chance that their child will have Huntington disease?25% Duchenne muscular dystrophy (DMD) causes progressive muscle weakness and wasting. This is a serious condition with no known cure. DMD is sex-linked recessive. A couple is concerned because there is a history of DMD in the male's family. There is no history of this condition in the female's family. Even though both the male and the female are healthy, they are concerned that one of them may be a carrier.What is the chance that their child will have this condition?0% This couple goes away happy. What about other potential scenarios?A healthy male and a female carrier have a child. What is the chance that a girl child will have the condition?0% A healthy male and a female carrier have a child. What is the chance that a boy child will have the condition?25% A woman has a family history of two different genetic

diseases: cystic fibrosis and galactosemia. Both of these

diseases are caused by a recessive allele. The woman has been tested and finds that she is a carrier for both diseases. She wants to discuss what this means for possible future children she may have.Assume that uppercase C is a normal allele and lowercase c is an allele for cystic fibrosis. Which statement correctly describes how the law of segregation applies to these alleles?The woman's egg cells will be equally likely to contain a C allele or a c allele.If uppercase G represents a normal allele and lowercase g represents an allele for galactosemia, what are the possible gametes this woman can produce when considering both diseases?GC, Gc, gC, or gc An individual is healthy and of normal weight but has many family members who are obese. He is worried that he may also gain weight.Genetics can have an effect, but he can influence his weight with diet and exercise.