<span>The giraffe population in Africa has dropped about 40 percent in just 15 years, according to the GiraffeConservation Foundation. The organization's director, Dr. Julian Fennessy, told ABC News: "It's a silent extinction," noting that giraffe numbers have fallen to 80,000 from 140,000
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Answer:
Mutations rarely occur
Explanation:
Mutations are genetic changes, i.e., alterations in the DNA sequence. Generally, mutations have deleterious effects, but there are exceptions where mutations may confer an adaptive advantage in a given environment. Mutations are often deleterious, and thereby these genetic changes are rare events. In consequence, mutation rates, i.e., the frequency by which new mutations arise in an organism over time, are generally very low. Finally, mutations that arise only in germ cells can be inherited from a generation to the next generation, while somatic mutations cannot be inherited.
Answer:
Meiosis. This is the result of crossing over, which takes place during prophase I of meiosis. In this process, the sister chromatids exchange genes which causes no resulting daughter cell to be identitical.
Explanation:
A: ' 5’ GGATCC 3’ ' is a DNA sequence with one strand of a restriction enzyme recognition sequence.
A restriction enzyme refers to a DNA-cutting enzyme that recognizes particular sites in DNA. Various restriction enzymes create staggered cuts at or near their recognition sites, making ends with a single-stranded overhang. In case when two DNA molecules have matching ends, the enzyme DNA ligase can be used to join them. The restriction endonuclease enzyme (EcoRI) recognizes the 5'-GAATTC'-3 sequence of DNA and develops a single-strand cut between the G & A nucleotides.
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