All Questions
17 questions
2
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0
answers
64
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What is the DNA sequences between two Inverted Repeats called?
I would like to know some rules about the nomenclature of Inverted Repeats DNA sequences. More in detail, I want to know what is the name of sequences between two inverted repeats.
For example, I have ...
- 21
0
votes
1
answer
90
views
Do we come to know which allele is dominant by seeing family genration tree only?
I know that a Gene has Alleles (variation) and one is Dominant over Other i.e the Other Recessive.
Then I got a Thought that How can we tell whether an Allele is Dominant or Recessive...... and I came ...
- 109
10
votes
1
answer
208
views
What causes cells to inactivate one X-chromosome?
Normally, when a cell has two X-chromosomes (female genome), one is randomly inactivated. How does the cell detect that there are two X-chromosomes in the first place?
Is there some kind of protein ...
- 662
0
votes
0
answers
134
views
Number of DNA strands per chromosome
As I was reading Griffith's Introduction to genetic analysis this evidence was provided for single DNA makes single chromosome.
Eventually geneticists demonstrated directly that certain chromosomes ...
- 81
0
votes
1
answer
212
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Possible combinations in the Meiosis' Telophase 1
As you might already know
Meiosis is the process in eukaryotic, sexually-reproducing animals that reduces the number of chromosomes in a cell before reproduction $^{[1]}$
One of the reasons why ...
- 103
3
votes
0
answers
58
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Offspring of parents with different number of chromosomes
Many papers report that dog-whelks (Nucella lapillus) show a distinct chromosomal polymorphism between populations of 2n = 24 up to 2n = 36. Could somebody please tell me how many chromosomes the F1 ...
2
votes
2
answers
804
views
Why the genome is divided into several chromosomes and not just a single big chromosome?
In many eukaryote species, there are several chromosomes. In humans, for example, there are 23 pairs of chromosomes.
Why are there several chromosomes and not just a join of all chromosomes into a ...
2
votes
1
answer
598
views
Will a person with two copies of the same set of chromosomes be normal?
Would a (theoretical) woman (because she must have two X's), that both sets of
her chromosomes were 100% identical, be "normal"?
Would she be healthy, or would she have genetic problems as a result ...
13
votes
1
answer
1k
views
Why does size decrease across the sequence of human chromosomes?
The following graph shows a decrease in the number of base pairs per chromosome across the sequential set of human chromosomes:
Is this because chromosomes were originally numbered by their size on ...
- 519
3
votes
1
answer
427
views
Are genes uniformly dispersed throughout the genome?
I think that telomeres and centromeres are regions with a very low gene content (= regions that contain few genes). To the exception of telomeres and centromeres, are genes uniformly distributed ...
- 68.3k
9
votes
1
answer
4k
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What determines the number of chromosomes an organism carries?
This is an extension of this question about What limits chromosomal length?.
I am wondering what could be the specific reasons behind the number of chromosomes an organism carries. In other words, ...
- 2,903
3
votes
1
answer
5k
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How are 23 chromosomes in human sperm chosen?
I'm not biologist and I have just a basic knowledge. I've been thinking for a long time about the following question: How does the body choose which 23 chromosomes should be active in human sperm and ...
- 133
0
votes
2
answers
306
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Chromatids in metaphase?
Please see the following picture:
In my book, the author claims that these chromosomes are in metaphase (a metaphase stopped by cholchicin).
I don't understand why they don't have two chromatids...A ...
- 1,381
2
votes
2
answers
313
views
Maintaining purebred pedigrees and how to lessen chance of getting disease?
Many breeds of dogs are known for a high incidence of genetic disorders. German shepherd and Saint Bernard dogs are predisposed to developing a crippling condition called hip dysplasia.
Q: What ...
- 65
2
votes
2
answers
1k
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Question about Autosomal Recessive Alleles
I had a homework question that I could not figure out.
It states:
A woman has cystic fibrosis in her family and did not want to have a
child that suffered from the disease. She and her spouse ...
- 65
5
votes
1
answer
1k
views
What is the most genetically simple organism except viruses?
What is the most genetically simple organism (except viruses) on this planet?
By simple I mean the least number of genes.
- 657
16
votes
4
answers
61k
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Evolutionarily speaking, why do humans have 46 chromosomes
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Monkeys, chimpanzees, and Apes have 24 pairs (twenty-four pairs), for a total of 48.
What caused humans to have 46?
...
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