Answer:
B. there were more double crossovers in the progeny than would be expected based on probability
Explanation:
Crossing over or recombination can be defined as the exchange of genetic material between homologous chromosomes during meiosis. Moreover, the coefficient of coincidence is the number of double recombinants found in the progeny. The coefficient of coincidence can be estimated by the following equation:
Coefficient of coincidence (COC) = ADRF / EDRF
where ADRF = Actual Double Recombinant Frequency
and EDRF = Expected Double Recombinant Frequency
In the case above described, ADFR is higher than EDRF, and therefore COC will be higher than 1.
Answer:
The correct answer will be- the color change will be observed and the solution will turn purplish-black.
Explanation:
Iodine test is performed to test the presence of the carbohydrates mainly starch.
The iodine solution is chemically called potassium iodide which forms a yellow solution. The potassium iodide solution forms a complex with a starch solution which appears a purplish-black color which shows the presence of the carbohydrates.
In the given question, if we add the iodine solution to the beaker after a certain point of time then it will still form a complex with the starch and thus beaker solution will appear darker in color.
The lithosphere, that is, the solid earth is formed of a limited number of elements and is mainly composed of silicon and oxygen. Hydrosphere refers to all the waters on the Earth, that is, oceans, surface water, glaciers, and groundwater. It is formed of a limited number of elements and is mainly composed of hydrogen and oxygen.
The biosphere is the sum total of all the living matter and is formed of a limited number of elements comprising carbon, oxygen, nitrogen, hydrogen, phosphorus, and calcium. Atmosphere refers to the layers of gas around the planet Earth and is comprised of a limited number of elements, mainly the oxygen and nitrogen.
Thus, it can be said that very less percentage of elements are found in significant amounts in Earth’s biosphere, lithosphere, hydrosphere, and atmosphere in comparison to the total number of elements listed on the periodic table.
Answer:
The correct answer is option B. pheromones.
Explanation:
Pheromones are chemical substances that are released and produced by a different type of animals, into the environment, for marking their territory or affecting behaving of its species.
Wolves communicate by the chemical messages using their sense of smell. Such chemical messages are called pheromones, between different members of the same species.
Thus, the correct answer is option B. pheromones.
