Answer:
The correct answer is C
Explanation:
In asexual reproduction method, the offspring generated is identical genetically to the parents. But this is not the case in sexual reproduction. The reason being that the gametes or sex cells produced has only one set of chromosomes and are therefore haploid after the process of meiosis. Meiosis is the process when the offspring formed has chromosomes from two parents and is not identical to the parent. Only certain characteristics are inherited by the offspring from both the parents and offspring has different set of characteristics.
There is a process of assortment taking place inside the cell when the double set of chromosomes becomes one set in a gamete. Out of the pair of chromosomes, there is a random selection. Due to this random assortment, there is a genetic variation between the gametes as the gene alleles on the chromosome are not the same. This principle is said to be the Mendel’s first law of segregation.
Another process of combining chromosomes is the crossing over during the meiosis stage which results in variety of chromosomes. We can say that recombination is possible.
Hence, we can note that during assortment and crossing over, there is no chance for two offspring to be identical to the same mother or father with the exception of identical twins. In the case of identical twins, the genetically identical characteristics develops from same fertilized egg.
From the above process, the structure of gene gets changed creating a variant that can get transmitted to next generation. The change is caused by altering the single base units of DNA or rearranging larger section of genes.
It is False that the peripheral nervous system includes the brain and the spinal cord. It is actually the central nervous system that includes the brain and the spinal cord. The answer is false.
Dinoflagellates are a type of algae that live in a symbiotic relationship with the coral. The algae are autotrophic, meaning they can convert the energy of the sun into chemical energy that organisms can use. The algae share some of the nutrients they produce with the coral in exchange for coral's protection.
if the algae die off, the coral loses an important source of nutrients and dies too.
Answer:
Urine samples are easily obtained
Explanation:
- Urine samples can be used to test the hormones as well as their metabolites present in the body.
- Besides urine several other things can be used to test hormones such as using blood , saliva etc.
- However urine sample collection has an advantage over the blood samples because it is easier to collect urine rather than blood, one does not require needles, and other sterile things required for blood collection but all such complex things are not required for urine sample collection.
- All one needs to collect urine sample is a simple urine collection vial that is sterile and the sample volume is sufficient to perform the hormone tests, thus it is not invasive in any manner.