Answer:
The correct answer is "17,100 years".
Explanation:
Carbon-14 is a radioactive isotope of carbon that is normally present in all living organisms and due to its low content and slow pace of degradation it is widely used for dating purposes. The half-life of Carbon-14 is approximately 5,700 years, therefore, a wood that had gone through 3 half-lives of Carbon-14 will be approximately 17,100 years old. This calculation is made simply by multiplying three times the half-life of Carbon-14.
The correct answer is choice B. Nondisjunction.
Nondisjunction disorder occurs when either the homologous chromosomes or the sister chromatids fail to disconnect properly during cell division. This failure results in daughter cells with an abnormality in chromosomes.
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As you can see in the table provided below when you do a punnet's square for the given genotypes, you get the possible genotypes of their offspring.
Marked in blue are the genotypes homozygous for gene T.
There are 4 out of 16 of them or expressed as a decimal 0,25.
Answer:
The correct answer will be option E.
Explanation:
The features given in the question are the characteristics features of the group of bacteria belonging to Cyanobacteria.
These Cyanobacteria are the prokaryotes which are capable of synthesizing the food through a process called photosynthesis. These bacteria use sunlight as their energy, use water and air to synthesize food. They under anaerobic condition synthesize the nitrogen in special structures called heterocyst, a characteristic feature of cyanobacteria.
Thus, the features given in the question are:
1. contain photosystems to carry out photosynthesis.
2. producing oxygen
4. contain phycobilins
6. Hetrocysts: nitrogen-fixing structures.
7. The ancestor of plant chloroplasts.
Thus, option E is the correct answer.