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What trait of humans is not shared by the Luca?

Which trait of humans is not shared by the LUCA? Yes, that’s correct! You extract DNA from human bones in an ancient village buried by volcanic ash. You discover that there is an extremely high frequency of the LCT allele for lactase persistence.

Why do many domesticated animals and plants have low fitness when compared to their wild relatives?

All of the above Why do many domesticated animals and plants have low fitness when compared to their wild relatives? Inbreeding in domesticated varieties leads to low heterozygosity. Deleterious alleles may be linked to genes favored during artificial selection and hitchhike to high frequency.

Why do populations farther from Africa have more deleterious mutations in their genome?

Why do populations farther from Africa have more deleterious mutations in their genome? Repeated bottlenecks and founder effects made genetic drift more intense more often. The frequency of people with low cholesterol should increase in the U.S. population.

Which of the following traits characterize anatomically modern humans?

Anatomically, modern humans can generally be characterized by the lighter build of their skeletons compared to earlier humans. Modern humans have very large brains, which vary in size from population to population and between males and females, but the average size is approximately 1300 cubic centimeters.

What traits do modern humans have?

Modern humans have a number of anatomical characteristics that distinguish them from premodern humans. These include a small face, small jaws, small teeth, a vertical and high forehead, a narrow nasal aperture, a narrow body trunk, and long legs.

How old is the modern human?

about 200,000 years

Does human DNA change over time?

Our DNA changes as we age. Some of these changes are epigenetic—they modify DNA without altering the genetic sequence itself. Epigenetic changes affect how genes are turned on and off, or expressed, and thus help regulate how cells in different parts of the body use the same genetic code.

What do you call a change in DNA?

As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. …

How can I make my DNA stronger?

Replace with plant-based edibles such as vegetables, fruit and proteins like walnuts, beans and tofu. And we do believe that supplements like DHA, lutein, zeaxanthin, vitamin D-3, calcium and half a multivitamin twice a day are a good insurance policy against an imperfect diet.

Which polymerase is not capable of DNA repair?

It is part of the Y-family of DNA Polymerases, which are capable of performing DNA translesion synthesis (TLS). Translesion polymerases bypass DNA damage lesions during DNA replication – if a lesion is not repaired or bypassed the replication fork can stall and lead to cell death.

Can DNA repair itself if damaged?

Most damage to DNA is repaired by removal of the damaged bases followed by resynthesis of the excised region. Some lesions in DNA, however, can be repaired by direct reversal of the damage, which may be a more efficient way of dealing with specific types of DNA damage that occur frequently.

What is direct repair of DNA?

Direct repair is defined as the elimination of DNA and RNA damage using chemical reversion that does not require a nucleotide template, breakage of the phosphodiester backbone or DNA synthesis.

What are the three steps in DNA repair?

There are three types of repair mechanisms: direct reversal of the damage, excision repair, and postreplication repair.

What are the two types of DNA repair?

At least five major DNA repair pathways—base excision repair (BER), nucleotide excision repair (NER), mismatch repair (MMR), homologous recombination (HR) and non-homologous end joining (NHEJ)—are active throughout different stages of the cell cycle, allowing the cells to repair the DNA damage.

What is DNA damage and repair?

DNA Damage and Repair Mechanisms Changes to the cellular genome can generate errors in the transcription of DNA and ensuing translation into proteins necessary for signaling and cellular function. Sufficient DNA damage may trigger an apoptotic signaling cascade, forcing the cell into programmed cell death.