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
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- Which of the following defines polygenic inheritance? An inheritance pattern in which one allele is not fully dominant over another, so the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes An inheritance pattern in which the full and separate phenotypic effects of two alleles are apparent in heterozygous individuals An inheritance pattern in which a single gene affects multiple traits A pattern of inheritance in which multiple genes affect one traitarrow_forwardSuppose a maternal effect gene exists as a functional dominant allele and a nonfunctional recessive allele. A mother with the disorder produces all offspring without the disorder. Explain the genotype of the mother.arrow_forwardWhich genotype is indicative of the carriers of a trait associated with an autosomal recessive inheritance pattern? Tt TT tt All of thesearrow_forward
- This 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_forwardA 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_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
- The 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_forwardA 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_forwardExplain in your own words why the terms "dominant" and "recessive" in terms of genetic inheritance are context dependant. Typically, the terms dominant and recessive refer to the phenotype and not to alleles. In your answer, also explain why this is the case. If all cells carry the same DNA information, how is it that different cells may carry out different functions or that particular traits be expressed at different times of an organism's lifetime?arrow_forward
- considered the theory of the inheritance of acquired characteristics and noted that this theory is no longer accepted. Is the central dogma consistent with the theory of the inheritance of acquired characteristics? Why or why not?arrow_forwardDefine polygenic inheritance. List two human straits that follow this pattern of inheritance.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_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage LearningHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning