45. Two similar holotypes are called
(A) Monotype
(B) Neotype
(C) Isotype
(D) Syntype

Here’s a SEO-friendly article on the topic, optimized for search engines with a focus on the key phrase “two similar holotypes are called.” I’ve structured it for readability, included internal linking potential, and used H1/H2 tags via markdown headers.

Correct Answer to “Two Similar Holotypes Are Called”

In taxonomy and biological nomenclature, the question “Two similar holotypes are called” tests your understanding of type specimens under the International Code of Zoological Nomenclature (ICZN) or International Code of Nomenclature for algae, fungi, and plants (ICN).

The correct answer is (C) Isotype.

An isotype is a duplicate of the holotype— the single specimen designated as the name-bearing type for a species. When multiple identical or near-identical specimens from the same collection exist, they are labeled isotypes. This ensures researchers worldwide can access reliable references without risking damage to the original holotype.

This concept matters in fields like plant biology, microbiology, and genetics, where precise specimen identification supports research in population genetics or biodiversity studies.

Detailed Explanation of All Options

Understanding type specimens prevents errors in scientific naming. Here’s a breakdown of each choice:

• (A) Monotype
  A monotype refers to a species with only one known specimen serving as the holotype, with no duplicates. It does not describe two similar holotypes—it’s the opposite scenario. Rare in practice due to collection challenges.

• (B) Neotype
  A neotype is a new specimen selected as the type when the original holotype is lost, destroyed, or inadequate. It’s a replacement, not a duplicate of an existing holotype, so it doesn’t fit “two similar holotypes.”

• (C) Isotype (Correct)
  Isotypes are exact duplicates (paratypes prepared alongside the holotype) from the same type series. They match the holotype in quality and origin, allowing verification without handling the primary specimen. Key in herbarium collections for plant sciences.

• (D) Syntype
  Syntypes are multiple specimens used when no single holotype was designated originally. They are not necessarily “similar” duplicates of a holotype but co-equal types from a series, often varying slightly.

Why Isotype Matters in Biological Research

In your studies of genetics or plant biology, isotypes enable cross-verification in molecular analyses, like DNA barcoding. For example, an isotype of a rare Rajasthan-native plant species (common in Jaipur herbaria) confirms traits without depleting the holotype.

Practice MCQ Tip: Focus on ICZN/ICN rules for exams. Related searches: “holotype vs paratype,” “type specimens in taxonomy.”