Dna And Chromosomes Flashcards
1
Q
What is a chromosome?
A
Long molecule of DNA (polynucleotide) coiled around histones
2
Q
When are chromosomes visible?
A
When the cell is dividing- prophase onwards
3
Q
How are chromosomes formed?
A
Dna is combined with histone proteins
Dna-histone complex is coiled
The coils fold to form loops
Loops coil and pack together to form the chromosome
4
Q
Homologous chromosomes definition
A
• Chromosomes with the same shape & size with the same genes but different alleles
5
Q
What are karotypes?
A
images of a whole set of chromosomes taken with a microscope.
6
Q
Do prokaryotes have chromosomes? How?
A
In prokaryotic cells, DNA molecules are shorter, form a circle and are not associated with protein molecules
• Therefore, prokaryotes do not have chromosomes
