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Chromosomes
Chromosomes contain the genetic material DNA
1,309 Questions
How does the appearance of the chromosomes changes as you move through the list?
tHEY GROW SMALLER AND SMALLER AS YOU SCROLL THROUGH THE LIST, AND YOU SEE A CLEAR CHANGE INS IZE BY THE TIME THE LIST IS OVER.
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How many chromosomes does a cell have?
This can vary anywhere from 1 (e.g. bacteria cell) to several hundreds of thousands (e.g. multinucleated slime mold cell), depending on species.
In humans, the number of chromosomes in somatic cells (ordinary body cells) is 46 (23 pairs). The number of chromosomes in sex cells is 23, as they are haploid.
What information on a pedigree can tell yo whether a gene is on autosome or on a sex chromosomes?
You can tell by the patterns and, to a lesser extent, ratios of trait inheritance. Both sex-linked and autosomal traits can be dominant or recessive and the patterns for each type are different.
Usually for autosomal inheritance there isn't a difference in the ratios between males and females affected with the trait while in sex-link inheritance there is.
If there are traits that seem to skip a generation then they usually are recessive.
Genes that are located on the Y chromosome are passed from father to son, never to daughter whereas genes on the X chromosome can go to both. It's important to know that since normal human males only have one X, X-linked traits will be dominant for them whereas for females the trait can manifest in one dose (haplosufficiency) or would have to be in two doses (both X's would have to have the gene).
Chromosome 9p21 are related with coronary artery disease, diabetes, and multiple cancers. This is the most famous site for deletion when someone is suffering from cancer. I hope this is the brief introduction for the Chromosome 9p21.
What is the proportion of all zygotes that have an abnormal number of chromosomes?
One-half
(Source: The Developing Person: Through the Life Span, 7th ed. Kathleen Berger, pg. 79)
Sex-linked dominant is a rare way that a trait or disorder can be passed down through families. A single abnormal gene on the X chromosome can cause a sex-linked dominant disease.
Related terms and topics:
- Autosomal dominant
- Autosomal recessive
- Chromosome
- Gene
- Genetic counseling and prenatal diagnosis
- Heredity and disease
- Inheritance
- Sex-linked recessive
Inheritance - sex-linked dominant; Genetics - sex-linked dominant; X-linked dominant; Y-linked dominant
InformationInheritance of a specific disease, condition, or trait depends on the type of chromosome affected (autosomal or sex chromosome). It also depends on whether the trait is dominant or recessive. Sex-linked diseases are inherited through one of the sex chromosomes (the X or Y chromosome).
Dominant inheritance occurs when an abnormal gene from one parent is capable of causing disease, even though a matching gene from the other parent is normal. The abnormal gene dominates the gene pair.
For an X-linked dominant disorder: If the father carries the abnormal X gene, all of his daughters will inherit the disease and none of his sons will have the disease. If the mother carries the abnormal X gene, half of all their children (daughters and sons) will inherit the disease tendency.
In other words, if there are four children (two males and two females) and the mother is affected (one abnormal X, she has the disease) but the father is not, the statistical expectation is for:
- Two children (one girl and one boy) with the disease
- Two children (one girl and one boy) without the disease
If there are four children (two males and two females) and the father is affected (abnormal X, he has the disease) but the mother is not, the statistical expectation is for:
- Two girls with the disease
- Two boys without the disease
This does not mean that the children will necessarily be affected.
What is the part of a chromosome instruction for a protein?
chromosomes contain there own RNA(ribo nucleic acid).therefore they are able to make there own proteins.
What would happen if DNA was straight?
DNA is twisted because that is the way the bonds cause it to form. Some things are just the way they are because of the way they are made.
What chemical are chromosomes made from?
Chromosomes are primarily made from DNA (deoxyribonucleic acid), which is a long molecule that carries genetic information. In addition to DNA, chromosomes contain proteins called histones, which help package and organize the DNA into a compact structure. This combination of DNA and proteins allows chromosomes to fit within the cell nucleus while regulating gene expression and DNA replication.
What happens when zygotes have serious chromosomal problems?
Most zygotes with serious chromosomal problems are born with severe mental and physical disabilities; many die before being born or shortly thereafter.
Are alleles more than genes or genes more than alleles in eukaryotic cells?
An allele is essentially the same as a gene so there is no difference in quantity between the two in any cell. Gene is a more common general reference to genetic material at a particular locus whereas allele often refers to an example of variation at a gene locus. For example the allele for tall (T)
According to Mendel’s law of segregation, what happens to chromosomes during meiosis?
According to mendel's law of segregation, what happens to chromosomes during meiosis is that, allele pairs do separate leaving each and every cell with a single allele for each trait.
It means they are female.
Yes, most plants and animals have chromosomes (although the # of chromosomes varies in different species) If you eat fruit, vegetables, grains, or meat you are eating chromosomes.
How many chromosomes are present in an egg just produced by the ovaries?
In humans there are 23 single chromosomes. In a zygote there are 23 pairs.
