Answer:
Same phenotype but different genotype is possible due to presence of dominant allele
Explanation:
A person can have a dominant allele on both the homologous chromosomes while another person may have single dominant allele and a corresponding recessive allele.
Answer:
In the case of these two parents, a quarter of their children would have blue eyes.
Explanation:
It is not only possible, it is expected that this would happen an appreciable fraction of the time. Brown eyes are dominant. Suppose eye color were dependent on a single Mendelian gene with two alleles, Br for Brown eyes and Bl for Blue eyes. (As Tracey Bryan has explained, this is not true -- I want to explain what the answer would be even in the simple case.) This means the three possible combinations of two alleles give the following eye colors:
BrBr => Brown
BrBl => Brown
BlBl => Blue
Now suppose two brown-eyed people have a child. We can't tell from the fact that they have brown eyes which pairs of alleles they have. Each of them could have either BrBr or BrBl. Suppose they each have BrBl. When they are crossed (i.e., they have a child), the child gets one allele from its mother -- it has a 50-50 chance of getting either one -- and one allele from its father -- again it has a 50-50 chance of getting either one. So, the child has:
25% chance of getting Br from mother and Br from father => brown eyes;
25% chance of getting Br from mother and Bl from father => brown eyes;
25% chance of getting Bl from mother and Br from father => brown eyes;
25% chance of getting Bl from mother and Bl from father => blue eyes.
So in the case of these two parents, a quarter of their children would have blue eyes.
Answer:
The correct answer is option B. "It disrupts a larger area and produces less oil than drilling".
Explanation:
Oil extraction from tar sands is an inefficient way of extracting oil from a mixture of oil, sand, clay and water. The oil extraction from tar sands requires a considerable amount of energy and water and generates more pollution than oil drilling. Another downside of this process is that it disrupts a larger area and produces less oil than drilling. It is estimates that to produce one barrel of oil, 2 tons of oil sand should be processed.
Answer:
El umbral de audición es la intensidad mínima de sonido capaz de impresionar el oído humano. Aunque no siempre este umbral sea el mismo para todas las frecuencias que es capaz de percibir el oído humano, es el nivel mínimo de un sonido para que logre ser percibido.
Explanation:
