Question

Questions 19 and 20 please!

19. The rosy (ry) gene of Drosophila encodes an enzyme called xanthine dehydrogenase. Flies homozygous for ry mutations exhibit a rosy eye color. Heterozygous females were made that had ryA1 Sb on one homolog and Ly ry 564 on the other homolog, where ryt1 and ry 564 are two independently isolated mutant alleles of ry. Ly (Lyra (narrow] wings) and Sb (Stubble [short] bristles) are dominant markers to the left and right of ry, respectively. Below is a diagram showing a map of this female's homologs showing relative gene and allele order. Lyt 1441 Sb Ly ry564 Sb+ These females are now mated to males homozygous for ry41 and wild type for Lyra and Stubble. If wild-type eye color progeny are found from this cross, draw an “X” where the crossover would have occurred? 20. Which of the following components are required to make a yeast artificial chromosome (YAC)? I. a yeast centromere a yeast origin of replication telomere sequences

Answer 1

The primary components of a YAC are the ARS, centromere, and telomeres from S. cerevisiae.so option 1 and 3 is correct

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