Unit 3 List 2 DNA & Heredity Flashcards

1
Q

allele

A

one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome

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2
Q

centromere

A

the region of a chromosome to which the microtubules of the spindle attach, via the kinetochore, during cell division

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3
Q

chromatid

A

each of the two threadlike strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA

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4
Q

chromosome

A

a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes

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5
Q

codon (chart)

A

A codon table can be used to translate a genetic code into a sequence of amino acids

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6
Q

crossing over

A

a cellular process that happens during meiosis when chromosomes of the same type are lined up

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7
Q

daughter cell

A

the cells that are formed after cell division

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8
Q

deletion

A

A type of genetic change that involves the absence of a segment of DNA

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9
Q

diploid

A

the presence of two complete sets of chromosomes in an organism’s cells, with each parent contributing a chromosome to each pair

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10
Q

DNA

A

the molecule that carries genetic information for the development and functioning of an organism

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11
Q

fertilization

A

The process by which two gametes (reproductive cells having a single, haploid set of chromosomes) fuse to become a zygote, which develops into a new organism

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12
Q

frameshift

A

a genetic mutation caused by a deletion or insertion in a DNA sequence that shifts the way the sequence is read

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13
Q

gamete

A

a reproductive cell of an animal or plant

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14
Q

gene

A

The basic unit of heredity passed from parent to child

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15
Q

gene mutation

A

a change to a gene’s DNA sequence to produce something different

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16
Q

genetic code

A

the instructions contained in a gene that tell a cell how to make a specific protein

17
Q

genetic variation

A

the presence of differences in sequences of genes between individual organisms of a species

18
Q

haploid

A

a cell that contains a single set of chromosomes

19
Q

homologous chromosome

A

pairs of chromosomes in a diploid organism that have similar genes, although not necessarily identical

20
Q

independent assortment

A

a genetic principle that states that the alleles of two genes will segregate into daughter cells independent of one another

21
Q

insertion

A

a type of mutation that involves the addition of one or more nucleotides into a segment of DNA

22
Q

meiosis

A

a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells

23
Q

meiosis I

A

homologous chromosomes pair and then separate

24
Q

meiosis II

A

a mitotic division of each of the haploid cells produced in meiosis I

25
monosomy
the absence of one member of a pair of chromosomes
26
mutagen
a chemical or physical agent capable of inducing changes in DNA called mutations
27
mutation
Any change in the DNA sequence of a cell
28
nondisjunction
the failure of the chromosomes to separate, which produces daughter cells with abnormal numbers of chromosomes
29
offspring
the young creation of living organisms, produced either by sexual or asexual reproduction
30
parent cell
A cell that is the source of other cells, as a cell that divides to produce two or more daughter cells, or a stem cell that is a progenitor of other cells or is the first in a line of developing cells
31
replication
the process by which the genome's DNA is copied in cells
32
point mutation
A genetic alteration caused by the substitution of a single nucleotide for another nucleotide
33
sexual reproduction
the production of new organisms by the combination of genetic information of two individuals of different sexes
34
somatic cell
the cells in the body other than sperm and egg cells
35
substitution
a type of mutation in which one nucleotide is replaced by a different nucleotide
36
trisomy
The presence of an extra chromosome in some or all of the body's cells
37
trait
a specific characteristic of an individual