Hox genes are regulatory genes
in multicellular animals that code
for transcription factors that
determine the basic body plan in
a developing embryo. They act
as switches that turn other genes
on and off. Scientists have found
that a mutation in a fruit fly hox
gene produces flies with legs
instead of antennae sticking out
of their heads. Another hox gene
mutation results in fruit flies with
two pairs of wings instead of one
pair. Hox genes affect body plans
by controlling the expression of
many other genes.
Many multicellular animals have
the same hox genes. Which
statement is evidence for this
claim?
(1 point)
The correct answer is "The body plans of complex animals are very similar to one another."
A comparison of the hox genes in different multicellular animals shows that they have similar sequences or structures.
the awnsers were
The body plans of complex animals typically have a large number of
mutations.
The body plans of complex animals are very similar to one another.
The body plans of complex animals change over generations.
There is a wide variety of body plans in complex animals.
To determine which statement is evidence for the claim that many multicellular animals have the same hox genes, we can look at the key idea mentioned in the passage – that Hox genes control the expression of many other genes and determine the basic body plan in developing embryos. In this case, we are looking for a statement that supports the idea that Hox genes are present in multiple multicellular animal species.
One possible statement that provides evidence for this claim could be:
"Scientists have observed that various species, including fruit flies and mammals like mice and humans, have similar Hox gene sequences and expression patterns, suggesting a conserved role of Hox genes in controlling body plan development across different animal species."
This statement indicates that Hox genes are found not only in fruit flies but also in other multicellular animals like mice and humans. The presence of similar Hox gene sequences and expression patterns in various species suggests that these genes play a conserved role in controlling body plan development across different animal species.