Which of the following model organisms has only one single chromosome (is haploid)? Xenopus (frog) Escherichia coli (E. coli bacterium) Drosophila melanogaster (fruitfly) Mus musculus (mouse) C. elegans (roundworm)

Question

Which of the following model organisms has only one single chromosome (is haploid)? Xenopus (frog) Escherichia coli (E. coli bacterium) Drosophila melanogaster (fruitfly) Mus musculus (mouse) C. elegans (roundworm)

Answer 1

*Escherichia coli (E. coli bacterium)*Most bacteria, including *E. coli*, have a single circular chromosome and are haploid. The other organisms listed are all eukaryotes and have multiple linear chromosomes and are typically diploid (or have diploid stages in their life cycle).

Question

Which of the following model organisms has only one single chromosome (is haploid)? Xenopus (frog) Escherichia coli (E. coli bacterium) Drosophila melanogaster (fruitfly) Mus musculus (mouse) C. elegans (roundworm)

Solution

Answer