Genes in the NK4 class are involved in heart development in both vertebrates and fruit flies. They are also involved in the development of pumping organs in organisms that lack a heart, such as roundworms and cnidarians
Available information suggests that in early animals, the ancestral NK4 gene and its associated regulatory network ________. A) evolved convergently in vertebrates and arthropods
B) were important in the development of the heart and blood vessels
C) evolved by duplication of the Hox cluster
D) governed the development of some fluid-filled pumping structure
E) did not have any function
D
You might also like to view...
The tree above is based on which type of traits and what is the genus name for the most recent horse?
A. Genetic (DNA): Orohippus.
B. Morphological: Equus.
C. Molecular: Equus.
D. Genetic homology: Pliohippus.
E. Morphological: Hyracotherium.
In a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers,
only blue flowers are produced. Plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, although other times they produce either red or blue flowers. When plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. Which gene is dominant? What will be an ideal response?
Active transport requires all of the following EXCEPT
A) a membrane. B) transport proteins. C) ATP. D) aquaporins. E) a gradient.
Cytochrome c is a respiratory pigment found in the mitochondria of eukaryotes. Compared with some other proteins, it has changed very slowly over long periods of time. Why?
What will be an ideal response?