Table 271 Proposed Number of Hox Genes in Various Extant and and Extinct

question 10

Multiple Choice

Table 27.1. Proposed Number of Hox Genes in Various Extant and Extinct Animals
-All things being equal, which of these is the simplest explanation for the change in the number of Hox genes from the last common ancestor of insects and vertebrates to ancestral vertebrates, as shown in Table 27.1?

• A) The occurrence of seven independent duplications of individual Hox genes.
• B) The occurrence of 14 independent duplications of individual Hox genes
• C) The occurrence of two distinct duplications of the entire seven-gene cluster, followed by the loss of one cluster.
• D) The occurrence of a single duplication of the entire seven-gene cluster.

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Definitions:

Opioid Abuse

The misuse of opioid drugs, including prescription painkillers and illicit substances like heroin, often leading to addiction, health problems, or overdose.

Bulimia Nervosa

An eating disorder characterized by episodes of binge eating followed by behaviors such as vomiting to prevent weight gain.

Substance Abuse

Engaging in harmful or dangerous activities involving psychoactive substances, including the use of alcohol and illegal drugs.

Increased Risk

A situation or condition that raises the likelihood of experiencing a negative outcome or developing a specific illness.