AP Bio chapter 5

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35 Terms

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Meiosis
Cell division in sexually reproducing organisms that forms gametes
Consists of two rounds of cell division but only one round of DNA replication
Results in four cells with haploid chromosome number
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Homologous chromosomes
Paired chromosomes. the same size, shape, and carry genes for the same traits
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Diploid
Complete set of paired chromosomes
# found in somatic (body) cells
2n
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Haploid
1 chromosome from each homologous pair
# found in reproductive cells
1n
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Autosomes
All other chromosomes except sex chromosomes
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Sex chromosomes
Determines gender
Male= XY
Female= XX
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Gamete
Reproductive cell
Contains haploid # of chromosomes
Generated during meiosis
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Somatic cell
Body cell
Contains diploid # of chromosomes
Generated during mitosis
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Crossing over
Exchange of genetic material between homologous chromosomes
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Zygote
Diploid cell produced by the union of haploid gametes (egg and sperm) during fertilization
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True-breeding
Organisms that produce offspring of the same variety over many generations of self-pollination.homozygous
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P generation
True-breeding (homozygous) parent individuals from which F1 hybrid offspring are derived. "p" stands for parental
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F1 generation
Hybrid (heterozygous) offspring arising from a parental (P generation) cross
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Hybrid
Heterozygous
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Allele
Different versions of a gene
Ex: A or a
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Genotype
Genetic makeup of an individual
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Phenotype
Physical traits
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Heterozygous
Having different alleles for a gene
Ex: Aa
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Homozygous
Having identical alleles for a gene
Ex: AA or aa
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Law of Segregation
Two alleles for a trait separate (segregate) during gamete formation and end up in different gametes
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Law of Independent Assortment
Each pair of alleles segregates independently of each other pair of alleles during gamete formation
Traits are independent and require own Punnett square
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Testcross
Crossing an organism with recessive individual
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Monohybrid cross
A cross between two organisms that are heterozygous resulting in 3:1 ratio of dominant to recessive phenotypes
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Dihybrid cross
A cross between two organisms that are heterozygous for TWO traits resulting in a 9:3:3:1 ratio
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Polygenic
Traits that involve multiple genes
Ex: eye, skin, and hair color
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Multiple allele traits
Traits that have more than two alleles contributing to phenotype
Ex: blood type
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Sex-linked traits
A gene located on either sex chromosome
Most sex-linked genes are on the X chromosome
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Wild-type
Phenotype that most commonly observed in natural populations
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Recombinants
Offspring with non-parental phenotypes (new combinations of traits) due to crossing over between linked genes
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Recombination frequency
Divide total number of recombinants (non-parental phenotypes) by the total number of offspring
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Linked genes
Genes located close enough together on a chromosome that they tend to be inherited together
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Linkage map
A genetic map of a chromosome based on recombination frequencies
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Map units
Distances between genes. one map unit represents a 1% recombination frequency
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Nondisjunction
The failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during meiosis
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Pedigree
A chart or "family tree" that tracks which members of a family have a particular trait