The answer is <span>B) three chromosomes in any one set.
In a human diploid somatic cell (2n), there are 22 chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes (so choice C. does not indicate a genetic problem). There are in total 46 chromosomes (23 pairs in 2 copies), that differs in lengths (so choice D. does not indicate a genetic problem). Speaking of a pair of sex chromosomes, there could be two X chromosomes in females or one X and one Y chromosome in males (so choice A. </span><span>does not indicate a genetic problem).
But, having three chromosomes in </span>any one set suggests a presence of trisomy, which is <span> a condition in which an extra copy
of some chromosome is present. This results in a genetic disorder.</span>
Answer:
Option A, cribra orbitalia in eye orbits.
Explanation:
Cribra orbitalia (CO) in eye orbits is caused by the iron deficiency of anemia which leads to weakening of bones of eye sockets by making it porous. It is also known as porotic hyperostosis of the orbital roof. Some of the common causes of this disease as claimed by researchers are malnutrition, insufficient diet and parasite.
Dietary deficiencies lowers the level of iron and other vitamins such as B9 and B12) thereby causing anemia known as megaloblastic anemia.
Hence option A is correct
In order to answer this, you will need to set up a Punett Square (I have attached a picture).
Since Rr is the genotype of round seeds, we know that round must be dominant to wrinkled, and therefore represented by the allele, R.
Since rr is the genotype of wrinkled seeds, we know that wrinkled must be the recessive trait, and there represented by the allele, r.
Since the Punnett Square shows that the genotype ratio is 2Rr : 2rr, or simplified, 1Rr : 1rr, we now know that there is a
50% chance the offspring will have wrinkled seeds.
Answer:
option D
Explanation:
This is to test for the genotype of an organism that shows the dominant phenotype for a particular trait trait. To perform a testcross in determining the genotype of a plant, a true breeding pink flowering plant is usually utilized.
Homologous structures are structures that we find across different species. They have the same organisation (they have the same parts) but have different functions (they are used for different things).
homologous structures can be used to interpret evolution, because they show that different species share common features which must have been inherited from a common ancestor.
These structures have a different function because different species use these parts for different purposes. This supports evolution by supporting the claim that organisms adapt (change) in response to their environment.
Hope that helps, sorry if unclear