Concept explainers
To discuss:
What polygenic inheritance and pleiotropy suggest about the relationship between a certain
Introduction:
DNA is a genetic material consisting of a long stretch of
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
Anatomy & Physiology: The Unity of Form and Function
- Mutations in DNA that result in altered proteins can causehereditary diseases. Pedigree studies and genetic testing mayclarify the risk of disease. At the chromosome level, nondisjunctionduring meiosis can result in gametes with too few or too manychromosomes, most of which produce inviable offspring.Imprinting refers to inactivation of alleles depending on whichparent the alleles come from; offspring in whom imprinting occursappear haploid for the affected gene even though they are diploid. During spermatogenesis, is there any difference in outcome between first- and second-division nondisjunction?arrow_forwardThis is caused by the presence of certain cytoplasmic determinants from the expression of nuclear genes in the egg cell prior to fertilization. Delayed chromosomal inheritance Extrachromosomal Inheritance Codominance Inheritance Complete dominancearrow_forwardWhich genotype is indicative of the carriers of a trait associated with an autosomal recessive inheritance pattern? Tt TT tt All of thesearrow_forward
- A morphological trait is the physical association between two genes because they are on the same chromosome, also the inheritance patterns showing dependant assortment of alleles that result from this association true or false?arrow_forwardThe mode of inheritance of the auricular hypertrichous trait in the Brown family is clearly an instance of: Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. b d recessive inheritance with the females being carriers. dominant inheritance with the males being carriers. X-linked inheritance, which is being expressed in the males since they only have one X chromosome. Y-linked inheritance, which can never be passed on to females.arrow_forwardWhy do human sex-linked recessive traits typically show up in sons more than daughters? Hint: consider the probabilities involved in the inheritance of such traits.arrow_forward
- A 31 year old woman consults her physicain because she is concerned about developing breast cancer. She is currently in good health and she has never had any breast disease. Her concem arises bacause her sister has just been diagnosed as having breast cancer and her mother died of breast cancer. How can one determine if the cancer in this family is likely to be a dominantly inherited predisposition? b. What is the woman's cahnce of developing breast cancer? а.arrow_forwardGeneral properties of Sex-linked Inheritance, traits is always passed from the father to son and only males are affected. *arrow_forwardA gene is termed when one copy is needed for the trait to be expressed genomic dominant recessive importantarrow_forward
- Explain why Y-linked traits are passed only from fathers tosons.arrow_forwardWhen does the erasure and reestablishment phase of genomicimprinting occur? Explain why it is necessary to erase an imprintand then reestablish it in order to always maintain imprinting fromthe same sex of parent.arrow_forwardVariations in Phenotype Expression Define penetrance and expressivity.arrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage LearningBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning