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Chromosomes
Chromosomes contain the genetic material DNA
1,309 Questions
How many chromosomes does a zorse have?
1000000
there are three different species of zebra.
Grevy's Zebra has 22226 chromosomes,
Plains Zebra has 44 chromosomes
Mountain Zebra has 333333 chromosomes
Do genes on a chromosome determine whether a baby is a boy or a girl?
yes particular one's do which are the xy chromasones
A Lobster's body cells do have a nucleus and organelles, hence they are classified as Eukaryotes. Lobsters themselves are properly described on the macroscopic not microscopic scale, and as such the Lobster organism itself doesn't possess a single nucleus; again, the term organelles refers to structures with a cell. On a macroscopic scale the lobster is said to possess organs.
There are 46 chromosomes in your body cells. The egg cells have half the amount of chromosomes as the body cells, so there are 23 chromosomes in the egg cells.
Autosomal recessive is one of several ways that a trait, disorder, or disease can be passed down through families.
An autosomal recessive disorder means two copies of an abnormal gene must be present in order for the disease or trait to develop.
Alternative NamesGenetics - autosomal recessive; Inheritance - autosomal recessive
InformationInheriting 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.
A mutation in a gene on one of the first 22 nonsex chromosomes can lead to an autosomal disorder.
Genes come in pairs. Recessive inheritance means both genes in a pair must be defective to cause disease. People with only one defective gene in the pair are considered carriers. However, they can pass the abnormal gene to their children.
CHANCES OF INHERITING A TRAIT
If you are born to parents who both carry an autosomal recessive change (mutation), you have a 1 in 4 chance of getting the malfunctioning genes from both parents and developing the disease. You have a 50% (1 in 2) chance of inheriting one abnormal gene. This would make you a carrier.
In other words, if four children are born to a couple who both carry the gene (but do not have signs of disease), the statistical expectation is as follows:
- One child is born with two normal genes (normal)
- Two children are born with one normal and one abnormal gene (carriers, without disease)
- One child is born with two abnormal genes (at risk for the disease)
Note: This does not mean that children will necessarily be affected.
See also:
- Autosomal dominant
- Genetic counseling and prenatal diagnosis
- Heredity and disease
- Sex-linked dominant
- Sex-linked recessive
How the 2 sex chromosomes compare to each other in female fruit flies?
There is a 50% chance of having a male or a female each time sex chromosomes and inherited. the 'X' chromosome is received from the mother. The 'Y' chromosome is received from the father.
How does crossing over occur more frequently between genes that are close together on chromosomes?
with some qualification, especially around the centromeres and telomeres, one can say that crossing over is somewhat randomly distributed over the length of the chromosome two loci that are far apart are more likely to have crossover than two loci that are close together.
From: Concepts of Generics
What technique do geneticists use to count and study an individual's chromosome?
Geneticists use a technique called Karyotyping. Scientists take a picture of chromosomes and then arrange them in pairs to end up with 22 chromosomes and another pair that determines sex; chromosome (X,X ) for female or (X,Y) for males.
Then you can determine mutation when some chromosomes are missing, ex: missing chromosome 13 will result in Patau Syndrome, or missing chromosome 18 results in Edward's Syndrome
What happens if a person have more or less chromosomes?
Having additional or missing chromosomes can have a variety of effects, ranging from mild to fatal. For example, females missing an X chromosome (they would normal have two) suffer from a condition known as Turner syndrome, which can cause problems like stunted growth and infertility.
An example of a condition involving an additional chromosome is Trisomy 21, more commonly known as Down syndrome. In this instance, the individual has an extra 21st chromosome--they should have two, but instead have three. This tends to lead to growth defects and mental retardation.
More severe chromosome abnormalities can be fatal--some will result in miscarriage during fetal development.
If a human cell has 46 chromosomes how many would you expect in reproductive cells?
The answer is................46.
What part of the human body is like to the chromosome?
The Brain. Chromosomes contain the genes that contain the instructions to make everything that a cell needs to function. A brain contains all of the information that a person needs to function.
Do the chromosomes line up in the center of the cell?
They line up during metaphase of mitosis and meiosis
How many chromosomes does each parent sex cell give to their offspring?
Each parent sex cell gives 23 chromosomes to their offspring in humans
What is a chromosome pair that has a extra chromosome attached to it?
A Trisomy 1. Another said this was Down's Syndrome.
