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Arabidopsis thaliana was the first plant to have its genome sequenced. which of the following is incorrect about Arabidopsis?

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  1. It belongs to family Brassicaceae.
  2. 70 percent genes are duplicated.
  3. It has haploid chromosome number 8 .
  4. The genome is about 135 Mbp in size.

Answer (Detailed Solution Below)

Option 3 : It has haploid chromosome number 8 .
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Detailed Solution

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The correct answer is It has haploid chromosome number 8

Concept:

  • Arabidopsis thaliana is a small flowering plant that is widely used as a model organism in plant biology and genetics.
  • It belongs to the family Brassicaceae, which also includes economically important species like cabbage and mustard.
  • Arabidopsis was the first plant to have its entire genome sequenced, making it a cornerstone for genetic and genomic studies in plants.
  • The genome of Arabidopsis is relatively small, around 135 million base pairs (Mbp), and consists of five chromosomes.

Explanation:

  • It belongs to family Brassicaceae: This is correct. Arabidopsis thaliana is a member of the family Brassicaceae, which is also known as the mustard family.
  • 70 percent genes are duplicated: This is correct. Arabidopsis thaliana has a high level of gene duplication, with approximately 70% of its genes being duplicated.
  • It has haploid chromosome number 8: This is incorrect. The correct haploid chromosome number for Arabidopsis thaliana is 5, not 8.
  • The genome is about 135 Mbp in size: This is correct. The Arabidopsis thaliana genome is approximately 135 million base pairs in size, making it relatively small and manageable for genetic studies.
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