Heterochrony and Skeletal Structures

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Which genes control the spatial organization of body parts?

Homeotic genes (correct)

Hox genes

Master regulatory genes

Developmental genes

What is the role of Hox genes in animal development?

Control spatial organization

Determine body form

Facilitate gene duplication

Provide positional information (correct)

How did six-legged insects likely evolve from a many-legged crustacean ancestor?

Changes in the Hox gene Ubx (correct)

Regulatory changes in developmental genes

Changes in gene sequence

Gene duplication events

What is the likely role of new developmental genes arising from gene duplication events?

Facilitate the origin of novel morphological forms Signup and view all the answers

What causes the loss of spines in lake stickleback fish?

Differences in gene regulation compared to marine sticklebacks Signup and view all the answers

What can regulatory changes in developmental genes be limited to?

Individual cell types Signup and view all the answers

What is the likely role of changes in the regulation of developmental genes in the evolution of body form?

Important role Signup and view all the answers

What are homeotic genes?

Master regulatory genes Signup and view all the answers

What is the likely role of Hox genes in the evolution of body form?

Determine body form Signup and view all the answers

What is the likely role of changes in gene sequence in the evolution of body form?

Limited role Signup and view all the answers

Which of the following is an example of heterochrony mentioned in the text?

Changes in the skeletal structure of bat wings Signup and view all the answers

What does paedomorphosis refer to?

The retention of juvenile structures in sexually mature species Signup and view all the answers

In paedomorphosis, how does the rate of reproductive development compare to somatic development?

It accelerates Signup and view all the answers

What can heterochrony alter in terms of reproductive development?

The timing of reproductive development Signup and view all the answers

Which of the following is not an example of heterochrony?

Changes in the relative skull growth rates Signup and view all the answers

What is the result of increased growth rates of finger bones in bat wings?

Changes in the skeletal structure Signup and view all the answers

What is the main focus of the text?

Changes in the skeletal structure of bat wings Signup and view all the answers

What does heterochrony refer to in the context of the text?

Changes in the reproductive development of nonreproductive organs Signup and view all the answers

What is the result of paedomorphosis?

Retention of juvenile structures in sexually mature species Signup and view all the answers

What is the term used to describe the elongated hand and finger bones in a bat wing?

Heterochrony Signup and view all the answers