D2.1 - cells and nuclear division Flashcards

1
Q

microtubules

A

long, thin fibrous proteins that forms the spindle

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2
Q

microtubule motors

A

binds to microtubules & hydrolyses ATP to produce energy to move chromosomes during cell division

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3
Q

Budding

A

asexual reproduction in yeast

  • outgrowth of genetically identical daughter cell (bud from parent cell)
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4
Q

hydra

A

genus of small aquatic invertebrates that bud
- rapid increase in population

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5
Q

budding scar

A

determines how old & how many times the cell has divided

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6
Q

prokaryotic vs eukaryotic division

A

prokaryotic: divides by binary fission

eukaryotic: mitosis or meiosis (to create gametes)

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7
Q

homozygous

A

two of the same allele

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8
Q

heterozygous

A

two different alleles

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9
Q

mitosis

A

Mitosis is a type of nuclear division that produces two genetically identical diploid daughter nuclei for somatic cells

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10
Q

chromosome

A

wo genetically identical sister chromatids held together at the centromere.

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11
Q

microtubule organising centres (MTOCs)

A

Structures within cells that regulate the formation and organisation of spindle fibres. (PLANT CELL)

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12
Q

centrosomes

A

a type of MTOC that contains centrioles. MTOCs migrate to each pole (end) of the cell during prophase.

(ANIMAL CELLS)

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13
Q

meiosis

A

type of nuclear division that produces four haploid genetically unique daughter nuclei, which will form gametes for sexual reproduction

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14
Q

bivalent/ tetrad

A

A pair of homologous chromosomes that come together during prophase I of meiosis.

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15
Q

homologous pair

A

Paired chromosomes that have the same genes at the same locations.

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16
Q

allele

A

a variant/ version of a gene

17
Q

Karyotyping

A

Determining or analysing the karyotype (number, size and shape of the chromosomes) of an individual.

18
Q

chiasmata

A

points at which crossing over occurs between two non-sister chromatids

19
Q

non-recombinant chromatids

A

Chromatids that have not undergone crossing over.

20
Q

meristem

A

Regions of undifferentiated cells at the tips of roots and shoots, in plants, that have the potential to become any cell type in the plant.

21
Q

mutation

A

changes in DNA sequence

22
Q

cyclins

A

family of proteins that regulate the cell cycle.
- binds to and activates CDK enzymes that phosphorylate specific proteins.

23
Q

mutation

A
  • change in sequence of genetic material
24
Q

hermaphroditic

A

An organism with both male and female reproductive organs

ex. pea plant

25
true breeding parents
An organism that always passes on its phenotypic traits to the offspring.
26
genes
segment of DNA that codes for specific protein
27
genotype
- different combinations of alleles
28
phenotype
- physical traits - outward expression of allele combos with environmental factors
29
SNP
single nucleotide polymorphism - most common variants in humans - at single nucleotide/base pair when genome is copied - can be in a gene that codes for a protein or in parts of the DNA for other functions
30
explain blood type and multiple alleles
- A, B and O allelic forms - chromosome 9 - ABO gene - each make their own enzyme that catalyze specific sugars on the outside of the cell - sugars produce immune response - antigens
31
codominant
2 alleles are both expressed equally - AB blood type
32
incomplete dominance
A third phenotype that is intermediate between the dominant and recessive can be produced.
33
linked vs unlinked
linked - Genes on the same chromosome that are usually inherited together unlinked - genes on different chromosomes
34
mitotic index
proportion of actively diving cells
35
tumor suppressor genes and protooncogenes in mutations
tumor suppressor genes: code proteins that suppress cell growth protooncogenes: code proteins to promote cell growth mutations in those genes cause uncontrolled division
36
Outline the process of cytokinesis in plant and animal cells.
animal cells: actin and myosin proteins form contractile ring pinches cell membrane together (fluidity helps) forms cleavage furrow plant cells: cell plate, formed when vesicles (that contain materials) fuse in the middle forms new cell wall
37
aneuploidy and polyploidy
don't add to 46. extra or missing chromosome(s)
38
law of segregation
gametes only carry one allele for a gene
39