The Chromosomal Theory of inheritance, proposed by Sutton and Boveri, states
that chromosomes are the vehicles of genetic heredity
. Neither Mendelian genetics
Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early 20th century group of answer choices?
2) Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early 20th century? …
Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis.
Which of the following principles is part of the chromosome theory of inheritance?
Recall that all the patterns of inheritance observed by Mendel, including
the principle of segregation and the principle of independent assortment
are explained by the behavior of chromosomes during meiosis. These principles are part of the chromosome theory of inheritance.
Which of the following is known as a Philadelphia chromosome?
Philadelphia chromosome.
A piece of chromosome 9
and a piece of chromosome 22 break off and trade places. The BCR-ABL gene is formed on chromosome 22 where the piece of chromosome 9 attaches. The changed chromosome 22 is called the Philadelphia chromosome.
Why do females show a Barr body in their cells?
A Barr Body is an inactivated, condensed X chromosome found in female cells. Since females possess two X chromosomes and males have one X chromosome and a Y chromosomes, Barr bodies are
essential to regulate the amount of X-linked gene product being transcribed
.
What is correct about linked genes?
When genes are found on different chromosomes or far apart on the same chromosome, they assort independently and are said to be unlinked.
When genes are close together on the same chromosome, they are
said to be linked.
What is inheritance theory?
The Chromosomal Theory of inheritance, proposed by Sutton and Boveri, states
that chromosomes are the vehicles of genetic heredity
. Neither Mendelian genetics nor gene linkage is perfectly accurate; instead, chromosome behavior involves segregation, independent assortment, and occasionally, linkage.
Which of the following is the best definition of homologous chromosomes?
Homologous chromosomes are chromosomes
which contain the same genes in the same order along their chromosomal arms
. There are two main properties of homologous chromosomes: the length of chromosomal arms and the placement of the centromere.
Why it is called Philadelphia chromosome?
The abnormally shortened chromosome was discovered by both Hungerford, of the Fox Chase Cancer Center, and Nowell of the University of Pennsylvania, and was therefore named the Philadelphia Chromosome
after the city in which both institutions were located
.
What is the Ph chromosome?
Philadelphia chromosome (Ph): The chromosome abnormality that causes chronic myeloid leukemia (CML). Abbreviated as the Ph chromosome. The Ph chromosome is
an abnormally short chromosome 22
that is one of the two chromosomes involved in a translocation (an exchange of material) with chromosome 9.
What is PH positive ALL?
Philadelphia Chromosome positive acute lymphoblastic leukemia (Ph+ALL) is a
rare subtype of
the most common childhood cancer, acute lymphoblastic leukemia (ALL). Like ALL, Ph+ ALL is a cancer of a type of white blood cell called lymphocytes.
How many Barr bodies does a woman have?
These masses are called Barr bodies after the cytologist who discovered them. XX females have
one Barr body per cell
, XXX females have 2 Barr bodies per cell, and XXY Klinefelter males have one Barr body per cell (Barr bodies are not observed in XY males).
What is the purpose of Barr bodies?
A Barr Body is an inactivated, condensed X chromosome found in female cells. Since females possess two X chromosomes and males have one X chromosome and a Y chromosomes, Barr bodies are
essential to regulate the amount of X-linked gene product being transcribed
.
Can you have an XXY chromosome?
Klinefelter syndrome
is a genetic condition in which a boy is born with an extra X chromosome. Instead of the typical XY chromosomes in men, they have XXY, so this condition is sometimes called XXY syndrome.
What is an example of linked genes?
When a pair or set of genes are on the same chromosome, they are usually inherited together or as a single unit. For example, in
fruit flies
the genes for eye color and the genes for wing length are on the same chromosome, thus are inherited together.
What are some linked genes in humans?
And so some of the more familiar sex-linked traits are
hemophilia
, red-green color blindness, congenital night blindness, some high blood pressure genes, Duchenne muscular dystrophy, and also Fragile X syndrome.
