During their early stages of development, the embryos of reptiles, birds, and ma
ID: 275313 • Letter: D
Question
During their early stages of development, the embryos of reptiles, birds, and mammals look very similar. This suggests that reptiles, birds, and mammals 0 have a common ancestor O live in the same types of environments O have undergone parallel evolution O are no longer undergoing evolution 0 have gotten rid of all their vestigial structures Question 6 2 pts Mice and humans differ in only 300 out of about 20,000 genes. How can we account for the fact that mice and humans look so different? O The same genes are used for different functions. O Different genes are transcribed at a particular location O The timing of gene expression varies. All of the above. O None of the above.Explanation / Answer
-have a common ancestor
Similarity in the early stages of embryos of reptiles, fish and mammals show that these animals develop similarly and they are related and also they have a common ancestor. They gradually evolve different traits.
6. Different genes are transcribed at a particular location
Mouse and human genome though similar, they have difference in gene expression and regulation processes. Studies highlight the importance of noncoding RNA and transposable elements in the regulation of gene expression and in the evolution of gene expression networks in mammalian genomes.
In the human genome, the major SINE family is made of so-called "Alu elements." There are more than 1 million copies of Alu, comprising more than 10 percent of human DNA, scattered throughout the genome, and some of them are likely still able to jump to new locations.
The mouse genome, however, doesn't have Alus; instead it has a distinct set of SINEs called B/ID elements.
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