The ABO and MN blood type frequencies of the Dunkers differ significantly from those of current American and German populations due to:
genetic drift
. … Vasodilation is the expansion of blood vessels near the body's surface in response to excessive cold.
What is the cause of the absence of A and B alleles in Native American populations?
gene migration. The absence of the A and B alleles in Native American populations is a result of: …
gene flow
.
What is the mutation known as trisomy 21 in which an extra copy of chromosome 21 is present more commonly known as quizlet?
Also known as
Down syndrome
, trisomy 21 is a genetic condition caused by an extra chromosome.
When individuals of the same species are reproductively isolated genetic differences may accumulate in sufficient number so that new species could emerge What would such an event be an example of?
When individuals of the same species are reproductively isolated, genetic differences may accumulate in sufficient number so that new species could, emerge. Such an event would be an example of:
macroevolution
.
What is the physical location of a gene within the genome called?
A locus
is the specific physical location of a gene or other DNA sequence on a chromosome, like a genetic street address. The plural of locus is “loci”.
What is the source of the extra chromosome 21?
These studies have concluded that the origin of the extra chromosome 21 was
maternal in approximately 80 percent of cases and paternal in about 20 percent
.
What kind of mutation causes trisomy 21 or Down syndrome quizlet?
Translocation trisomy 21
.
In this type of chromosomal change, only part of an extra copy of chromosome 21 is in the cells. The extra part of the chromosome gets “stuck” to another chromosome and gets transmitted into other cells as the cells divide. This type of change causes a small number of Down syndrome cases.
What blood type are Native American?
All major ABO blood alleles are found in most populations worldwide, whereas the majority of Native Americans are nearly exclusively in
the O group
.
Can DNA testing tell if you are Native American?
These censuses asked additional questions of Indians about tribal affiliation. … A DNA test may be able to tell you whether or not you're Indian, but it will not be able to tell you what tribe or nation your family comes from, and
DNA testing is not accepted by any tribe or nation
as proof of Indian ancestry.
Who is the richest Native American?
1.
Shakopee Mdewakanton
– Annual Revenue of $1 Billion. The Shakopee Mdewakanton are the wealthiest Native American tribe, going by the individual personal wealth.
Which of these is an example of temporal isolation between two species?
For example, a peculiar form of temporal isolation has been observed between two closely related species of
cicadas of the genus Magicicada
in the United States. Sexually mature adults of Magicicada tredecim emerge every 13 years, whereas those of M. septendecim emerge every 17 years.
What is a random change in allele frequency in a population called?
Genetic drift
describes random fluctuations in the numbers of gene variants in a population. Genetic drift takes place when the occurrence of variant forms of a gene, called alleles, increases and decreases by chance over time. These variations in the presence of alleles are measured as changes in allele frequencies.
What is the meaning of the phrase disease is an agent of natural selection?
What is the meaning of the phrase “disease is an agent of natural selection”?
Disease can favor survival of individuals who carry specific alleles
.
Which gender has stronger genes?
But according to physician and geneticist Dr. Sharon Moalem when it comes to health and long term survival,
women
are the stronger sex.
Where is gene located?
Genes are
contained in chromosomes
, which are in the cell nucleus. A chromosome contains hundreds to thousands of genes. Every normal human cell contains 23 pairs of chromosomes, for a total of 46 chromosomes. A trait is any gene-determined characteristic and is often determined by more than one gene.
How do you determine which chromosome is a gene on?
The chromosome on which the gene can be found.
The first number or letter used to describe a gene's
location represents the chromosome. Chromosomes 1 through 22 (the autosomes) are designated by their chromosome number. The sex chromosomes are designated by X or Y.
