What is a homeotic mutant? a. an individual with a structure located in the wrong place b. an individual with an abnormal head-to-tail axis c. an individual that is missing segments d. an individual with double the normal number of structures

Verified step by step guidance

1. Step 1: Understand the term 'homeotic mutant'. Homeotic mutants are organisms that have had one of their body parts replaced by another body part due to a mutation in a homeotic gene. These genes are responsible for the correct placement and development of body parts.
2. Step 2: Analyze the options. Option a suggests that a homeotic mutant is an individual with a structure located in the wrong place. This is consistent with the definition of homeotic mutants, as they have body parts replaced by others due to mutations.
3. Step 3: Evaluate the other options. Option b suggests that a homeotic mutant is an individual with an abnormal head-to-tail axis. This is not necessarily true for all homeotic mutants. Option c suggests that a homeotic mutant is an individual that is missing segments. This is not accurate, as homeotic mutants have body parts replaced, not missing. Option d suggests that a homeotic mutant is an individual with double the normal number of structures. This is also not accurate, as homeotic mutants have body parts replaced, not duplicated.
4. Step 4: Based on the analysis, the correct answer is option a: a homeotic mutant is an individual with a structure located in the wrong place.
5. Step 5: Remember that understanding the definitions and characteristics of biological terms is crucial for solving such problems.

Key Concepts

Homeotic Genes

Homeotic genes are a group of regulatory genes that control the development of anatomical structures in various organisms. They play a crucial role in determining the identity of body segments during embryonic development. Mutations in these genes can lead to homeotic mutants, where body parts develop in incorrect locations.

Mutations and Developmental Biology

In developmental biology, mutations refer to changes in the DNA sequence that can affect an organism's phenotype. Homeotic mutations specifically alter the normal pattern of development, leading to misplacement of structures. Understanding how these mutations impact development is essential for studying evolutionary biology and genetics.

Phenotypic Expression

Phenotypic expression is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences. In the context of homeotic mutants, phenotypic expression can manifest as structures appearing in incorrect locations, which can help researchers identify the underlying genetic causes of developmental anomalies.