ch01 - Chapter 1 1.1 In a few sentences what were Mendels...

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1.1 In a few sentences, what were Mendel’s key ideas about inheritance? ANS: Mendel postulated transmissible factors—genes—to explain the inheritance of traits. He discovered that genes exist in different forms, which we now call alleles. Each organism carries two copies of each gene. During reproduction, one of the gene copies is randomly incorporated into each gamete. When the male and female gametes unite at fertilization, the gene copy number is restored to two different alleles may coexist in an organism. During the production of gametes, they separate from each other without having been altered by coexistence. FEEDBACK: 1.2 DIFFICULTY: easy 1.2 Both DNA and RNA are composed of nucleotides. What molecules combine to form a nucleotide? ANS: Each nucleotide consists of a sugar, a nitrogen-containing base, and a phosphate. FEEDBACK: 1.2 DIFFICULTY: easy 1.3 Which bases are present in DNA? Which bases are present in RNA? Which sugars are present in each of these nucleic acids? ANS: The bases present in DNA are adenine, thymine, guanine, and cytosine; the bases present in RNA are adenine, uracil, guanine, and cytosine. The sugar in DNA is deoxyribose; the sugar in RNA is ribose. FEEDBACK: 1.2 DIFFICULTY: medium 1.4 What is a genome? ANS: A genome is the set of all the DNA molecules that are characteristic of an organism. Each DNA molecule forms one chromosome in a cell of the organism. FEEDBACK:
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ch01 - Chapter 1 1.1 In a few sentences what were Mendels...

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