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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- Spring '08
- Genetics, Q7., dihybrid cross, homologs Chiasma Q3