Evolution__3rd_Edition

42 PART 1 / Introduction
Study and review questions
1 Review your understanding of the following genetic
terms: DNA, chromosome, gene, protein, genetic code,
transcription, translation, mRNA, tRNA, rRNA, mutation,
synonymous, non-synonymous, frameshift, inversion,
genetic locus, meiosis, genotype, phenotype,
homozygote, heterozygote, dominant, recessive,
linked, unlinked, and recombination.
2 What are the Mendelian ratios for the following
crosses: (i) AA × AA, (ii) AA × Aa, (iii) Aa × Aa,
(iv) AB/AB × AB/AB, when the A and B loci are unlinked,
and (v) AB/AB × AB/AB, when the A and B loci are tightly
linked (r = 0)?
3 What are the ratio, or fractions, of gametes
(according to their gene combinations) produced by
an individual with the two-locus genotype AB/ab if:
(i) the A and B loci are unlinked, and (ii) the A and B loci
are linked and the rate of recombination between the
two loci is r?
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