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17 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Autosome(s) |
A non-sex chromosome, not a gamete |
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Linked Genes |
Genes on the same chromosome |
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Sex-linked Trait |
A trait determined by genes found on a sex chromosome |
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Lethal Recessive |
When both X chromosomes alleles are recessive, the result can be death, or malformation. This is more frequent in males. |
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Name the three parts of the Chromosomal Theory |
1. Chromosomes carry genes 2. Paired chromosomes (homologous) segregate during meiosis 3. Sex cells (gametes) have half the number of chromosomes that a somatic cell has; 23 |
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Female Sex Chromosome is represented as: |
XX |
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A male sex chromosome is represented as: |
XY |
Like a gene compass |
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Barr Body |
Dark spot in the centromere of a X chromosome, in females. One X chromosome will have this, and the other will not, making the X chromosome with the Barr body inactive (no trait). |
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Linkage group |
A group of linked genes on a chromosome |
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Locus (loci) |
The specific location along a chromosome where a particular gene is found |
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Marker Gene |
Easy to trace gene used to trace another, more difficult to find gene. A marker gene must be on the same chromosome. |
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What is the expected linked gene ratio? What is it actually? Why? |
a) 9:3:3:1 b) 3:1 c) Linked genes, on the same chromosome, do NOT separate independently |
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Crossing Over |
Exchange of DNA from one chromosome to another during the synapsids phase of meiosis |
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How do we map chromosomes? |
We take the percentage of the "distance" of two chromosomes, and use them to find the locus. If the percentage is a smaller number, the two chromosomes are "closer" together. If the percentage is a larger number, the two chromosomes are "further" apart.
ie) 1% is 1 map unit (mu) apart 12% is 12 map units apart |
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Rosalind Franklin |
Created the X-Ray Diffraction Theory and produced the first image of DNA |
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Watson & Crick |
Stole the X-ray Diffraction and used other known information to piece together the first structure of DNA with a 3D model. They won the novel prize. |
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AB blood is ____________ to each other. O blood is ___________ to type A or B. |
a) codominant b) recessive |
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