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19 Cards in this Set
- Front
- Back
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epistasis
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The presence of an allele at one gene masks
the phenotype of another |
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prototroph
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makes its own factors and can grow on minimal media
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complementation test
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take two homozygous recessive mutants (I.e. Arg1-/Arg1- and
Arg2-/Arg2-) and cross them |
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karyotype
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the array of chromosomes in a given cell
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syncytium
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an animal cell containing more than one nucleus
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synapsis
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pairing of homologous chromosomes
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chromatid
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one of the two identical halves of a replicated chromosome
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polar body
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cell produced by meiosis that does not become a gamete
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ovum
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the female reproductive cell or gamete of animals, which is capable of developing, usually only after fertilization, into a new individual.
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mitosis
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How chromosomes
segregate to produce cells that are exact copies of each other |
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meiosis
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How chromosomes
segregate to produce gametes |
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The two copies of a chromosome are:
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sister chromatids
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In a D/d cell, D and d are on:
homologs non-homologous chromosomes sister chromatids different strands of DNA I don’t know |
homologs
(2n cells) |
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Microtubules attach to the chromosome via the ________
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Microtubules attach to the chromosome via the kinetochore
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The kinetochore assembles on the region of the chromosome
called a _________ |
The kinetochore assembles on the region of the chromosome
called a centromere |
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complementation
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process in which heterozygosity for chromosomes bearing mutant recessive alleles for two different genes produced a normal phenotype
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The epg (e) and mep (m) mutations map to the same chromosome. In a complementation test, epg and mep complement each other. Think about the progeny of that complementation test. How would you write their genotype?
1) EM / em 2) E/e; M/m 3) Em / eM 4) e/e; m/m 5) e/m |
3) Em / eM
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You have isolated two new recessive mutations, a and b, that cause
fruit flies to be blind. What genotypes (correctly written) would you cross to test whether a and b are mutations in the same gene? |
a/a X b/b
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What holds homologs or sisters
together until anaphase in meiosis II? |
chiasma & cohesion
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