NUR 4160 Genetics Final Exam, Complete Solution.QUASTION AND ANSWER 98% SCORE

5.What is the term used to define alternative forms of a gene that may result in different expression of the trait coded for by that gene? A. Alleles B. Bases C. Centromeres D. Diploids 5. ANS: A For each single gene, two alternative forms of that gene, known as alleles, together control how that gene is expressed. The alleles may be identical in their sequence but do not have to be. When a dominant allele is paired with a recessive allele, only the dominant allele is expressed and the recessive allele is silent. When a dominant allele is paired with another dominant allele, they are both expressed (usually equally). Recessive alleles are only expressed when they are homozygous. Bases are the essential part of a nucleotide of which there are many within any gene region. Centromeres are the pinched-in part of a chromosome between the p arms and the q arms. The term diploid refers to the normal number of chromosome pairs within a cell. It is an adjective, not a noun. Therefore, the plural diploids does not exist. 7.What is the term used to describe the organized picture of the paired chromosomes within a cell used to determine whether chromosome numbers, structures, and banding patterns are normal? A. Pedigree B. Phenotype C. Karyotype D. Autosome