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THE GIANT CHROSOMES IN THE ____ GLANDS OF THE BLOW FLY LARVAE AND OTHER FLY LARVAE ARISE HOW?
- BY REPEATED REPLICATION OF THE CHROSOMAL MATERIAL WITHOUT SEPERATION.
- EACH GIANT CHROSOME CONSISTS OF SEVERAL HUNDRED STRANDS.
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WHY ARE THE CHROSOMES OF THE BLY FLY HAVE SUCH GREAT LENGTHS.
BECAUSE THE STRANDS ARE NOT TIGHTLY COILED.
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WHAT DOES THE DARK BANDS REPRESENT ON BLY FLY CHROSOMES?
REPRESENTS AN AREA OF DNA CONCENTRATION. IT IS THOUGHT THAT EACH DARK BAND REPRESENTS THE LOCATION OF ONE OR MORE GENES.
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EACH CHROSOME IS ATTACHED TTO A CENTRAL MASS CALLED WHAT?
CHROMOCENTER
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WHAT DOES THE CHROMOCENTER CONSIST OF?
CONSISTS OF THE CENTROMERES OF THE CHROMOSOME AND SOME OF THE CHROMOSOMAL MATERIAL ADJECENT TO THE CENTROMERES.
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WHAT STAIN TYPE WAS USED TO VIEW THE BLY FLY CHROMOSOMES?
- ACETO-ORCEIN.
- IRON INTENSIVES THE STAINS.
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ARE ALL THE BANDS ON THE CHROSOMES ABOUT THE SAME WIDTH?
- NO.
- DIFFERENT CONCENTRATIONS OF DNA
- (ONE OR MORE GENES)
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How many chromosomes does a fruit fly (Drosophila) have?
8
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4 of the chromosomes came from the male parent and the 4came from its female parent, these two sets of chromosomes are _______, meaning that each of the 4 chromosomes that came from the male parent has a corrsponding chromosome from the female parent.
homologous (they have a similar structure and genetic function)
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A cell that contains both sets of homologous chromosomes is said to be _____, which means "two sets."
DIPLOID
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The number of chromosomes in a diploid cell is sometimes represented by the symbol 2N. Thus for the fruit fly, the diploid number is 8, which can be written as ______.
2N = 8
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Diploid cells contain two complete sets of chromosomes and two complete sets of ____. This agrees with Mendel's idea that the cell of an adult organism contain two copies of each ____.
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The gametes of sexually reproducing organisms contain only a single set of ____, and therefore only a single set of ____. Such cells are said to be _____, which means "one set." For a fruit fly, this can be written as ______.
chromosomes; genes; haploid; N=4
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What does crossing-over result in? what does it produce? Where is the material exchanged?
Results in the exchange of alleles between homologous chromosomes and produces new combinations of alleles. Exchange of material between NON - sister chromatids.
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Why is the results of Meiosis I different than mitosis when the number of chromatids is the same?
Because each pair of homologous chromosomes was separated, neither of the daughter cells has the two complete sets of chromosomes that it would have in a diploid cell.
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Each chromosome is actually a group of _______. It is the _______ that assort independently, not individual genes
linked genes; chromosomes
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What does crossing-over cause?
it separates genes that had been on the same chromosome onto homologous chromosomes
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