Answer: The correct answer for the given mechanisms influencing gene pool are the mechanisms of evolutionary change, which are described as follows-
1) Gene Flow
- It is described as the transfer of genes from one population to another population so that frequency of gene is increased.
-A zebra migrates to join a different herd of zebras.
2) Natural Selection
- A mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.
-Competition for sunlight leads to taller trees.
3) Mutation
- Permanent change in the nucleotide sequence of DNA ( genetic material) that could have harmful or useful consequences.
-The DNA of a snake changes to make its venom stronger.
4) Genetic Drift - It is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.
-A grassfire randomly sweeps through a population of buffalo and kills most of the animals.
Answer:
1. the cause of magnetic pole reversals
2. the year the next magnetic reversal will take place
4. the exact location of the next earthquake along the California coast
Explanation:
Due to magnetic striping patterns, the magnetic pole of earth go in reverse direction. When the magma comes out from the ocean floor so it spreads on the ocean floor making new bands. So these new bands that spreads the ocean floor make a new floor which change the polarity of the ocean floor in opposite direction. Due to this magnetic striping, the magnetic reversal will take place in which polarity of the earth crust reverses.
Answer:
1:2:0
Explanation:
If two recessive lethal alleles come together, they will be expressed and lead to the offspring's death. Let the dominant allele be S and the recessive allele be s. Here, the two individuals are heterozygous for it. So when they mate:
S s
S SS Ss
s Ss ss
1/4 have homozygous fominant genotype (SS), 2/4 have heterozygous genotype (Ss) and 1/4 have homozygous recessive (ss) genotype. Since 1/4 offspring have ss genotype, they will die. Hence, the usual 1:2:1 ratio has been modified here to only 1:2:0
Answer:
I am pretty sure it is, The consists of the bones that form the limbs and the bones that attach the limbs to the axial skeleton. But I am not positive, I hope this helps!!
Explanation:
Answer: Folate can prevent birth defects of the baby's brain because it helps to form the neural tube.
Explanation:
<u>Folate is the naturally occurring form of vitamin B9</u>. After its intake, the digestive system converts it into the active form of vitamin B9 that will eventually be used by the cells to perform different functions. Basically, the body uses it to make new cells, because<u> it is vital for cell growth and development.</u> It is an important part the diet and it is also important during pregnancy. This is because it helps prevent neural tube defects such as anencephaly or spina bifida among others that occur when the spine and brain of a baby do not develop completely.
<u>So, as stated above, folate is used during pregnancy because it play a role in the development and proliferation of the the neural tube.</u>
