Quiz IV-answer - Q7 When you need to know if certain...

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Quiz IV. May 1, 2009 BIO 325 Genetics – by Sung Write your name: (10 points total; 1 point ea.; no partial score) Q 1-5. Choose the best matching word for each question from the followings. Phenotype; genotype; F1; F2; testcross; monohybrid cross; dihybrid cross; epistasis; pleiotropy; codominance; incomplete dominance; autosome; sex chromosome; recombination; linkage; chiasma; mosaic Q1. Formation of new genetic combinations by exchange of parts between homologs recombination Q2. Structure formed at the spot where crossing-over occurs between homologs Chiasma Q3. The allels of one gene mask the effects of alleles of another gene epistasis Q4. Both parental phenotypes are expressed in F1 codomiannce Q5. F2 shows 9:3:3:1 ratio in their phenotypes Dihybrid cross Q6 ~ 7. Fill the blank Q6. Two short-haired cats were mated and produce six short-haired and two long-haired kittens. Short-hair is ( dominant ) to long-hair.
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Unformatted text preview: Q7. When you need to know if certain individual animals with certain phenotypes are pure-breeding or heterozygous for the phenotype, you can perform a ( test cross ). Q8. In radishes, color and shape are each controlled by a single locus with two incompletely dominant alleles. Color may be red ( RR ), purple ( Rr ), or white ( rr ) and shape can be long ( LL ), oval( Ll ), or round ( ll ). What is the probability to have red and long radishes from a typical dihybrid cross ( RrLl X RrLl )? 1/4 X 1/4 = 1/16 Q9. You do a cross between two true-breeding strains of zucchini. One has green fruit and the other has yellow fruit. The F1 plants are all green, but when these were crossed, F2 plants consists of 9 green : 7 yellow. What is the probability to obtain green fruit from the progeny of a testcross of the F1 plants? 1/4 Q10. Meiosis cannot occur in an organism whose genome is always haploid. True or False? True...
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