An organism described as 2n=4 has the chromosomes below with genes indicated by letters and centromeres indicated by periods. Select the BEST description of the chromosome aberration present in this organism.

AC.EGHJM          AC.EJM          QR.XZ          QR.XZ

Species 1 is described as 2n = 8 and has chromosome composition BBDDEEHH.

Species 2 is described as 2n = 10 and has chromosome composition NNPPSSXXZZ.

Select the best answer to classify the organism below based on its chromosome composition. Note that each letter represents a chromosome and that the organism below is either an individual from one of the species above or is derived from one or both species above.

Organism:   BBDEHH

An organism has the chromosomes shown below. Let the period represent the centromere.

L M N O . P Q R S T           and           L M N Q P . O R S T

Assume that a single crossover occurs between the P and Q loci in this individual. Which of the following are gametes that this individual will produce. Select all that apply.

An organism described as 2n=4 has the chromosomes below with genes indicated by letters and centromeres indicated by periods. Select the BEST description of the chromosome aberration present in this organism.

HJM.PRTZ          M.PRTZ          DF.GJH          DF.G

You are given the biochemical pathway below. Seven mutant strains (labeled S1 - S7) are defective in this pathway and cannot produce the end product when provided with minimal media. Each mutant strain is defective in only the one step indicated by the path. Select all metabolites that when added to minimal media (one at a time) will allow the mutant strain S2 to produce the end product in the reaction. If none of these metabolites will rescue the mutant strain, select "None of These".

You are given the biochemical pathway below. Seven mutant strains (labeled S1 - S7) are defective in this pathway and cannot produce the end product when provided with minimal media. Each mutant strain is defective in only the one step indicated by the path. Select all metabolites that when added to minimal media (one at a time) will allow the mutant strain S1 to produce the end product in the reaction. If none of these metabolites will rescue the mutant strain, select "None of These".