BIO 335 Exam 3 Questions and Answers Already Passed

BIO 335 Exam 3 Questions and Answers Already Passed The chromosome composition in humans The chromosome composition in humans refers to the total number and arrangement of chromosomes in human cells. Humans typically have 46 chromosomes, consisting of 23 pairs, with one set inherited from each parent. These chromosomes contain genetic material that carries the instructions for various traits and functions in the human body. What are the potential inheritance patterns in Mendel's experiments involving two factors? 1. Independent assortment 2. Linked assortment When considering independent assortment in Mendel's experiments with two factors, what method can be used to predict offspring trait ratios when the factors are located on separate chromosomes? Offspring trait ratios can be predicted using a Punnett square if the factors are on different chromosomes. In the context of independent assortment, where should the factors be located? On separate chromosomes 2 What is meant by linked assortment in Mendel's two-factor crosses? In linked assortment, the offspring trait ratios cannot be predicted using a Punnett square if the factors are on the same chromosome. In linked assortment, where should the factors be located? On the same chromosome On what process does linked allele assortment rely? Crossing over. Linked alleles segregate together without crossing over, while crossing over allows for the reassortment of linked alleles. While organisms possess thousands of genes, most have only a limited number of what? A few dozen chromosomes How many genes can a chromosome carry? Hundreds or even thousands Genes that are physically linked do not segregate independently and may not adhere to which principle put forth by Mendel? Mendel's Law of Independent Assortment What are linkage groups? Chromosomes 3 Explain the concept of linked linkage. Linked linkage refers to two or more genes that do not independently assort and are likely to be inherited together. What does the term "synteny" refer to? Synteny denotes the physical linkage of genes on the same chromosome. What does the number of linkage groups in a species represent? The number of different types of chromosomes in that species. Define genetic recombination. Genetic recombination occurs when offspring inherit a combination of alleles or traits that differ from those of their grandparents. In what two ways can genetic recombination occur? 1. Crossing over between linked genes on the same chromosome 2. Independent assortment of genes on different chromosomes What influences the likelihood of crossing over? The distance between the two genes. Greater distance increases the likelihood of crossing over. 4 How much recombination is observed between loci located on different chromosomes? 50% What level of recombination is typically seen between loci located far apart on a chromosome? 50% Loci positioned closely on a chromosome exhi