Unit 5: Heredity

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Sister chromatids

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Chapter 14

14 Terms

1

Sister chromatids

identical copies of the same chromosome (connected at the centromere).

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2

Homologous chromatids

similar but not identical chromosomes; one comes from each parent.

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3

Haploid

a cell with one set of chromosomes (n)

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4

Diploid

a cell with two sets of chromosomes (2n)

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5

Gametes

Sex cells (sperm and egg) produced through meiosis.

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6

Somatic cells

cells that divide through mitosis, not meiosis

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7

Zygote

A fertilized egg (diploid cell formed when gametes fuse)

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8

Alleles

Different versions of a gene

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9

Gene

A section of DNA that codes for a protein or RNA molecule

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10

Genotype

The combination of alleles (e.g., BB, Bb, bb)

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11

Phenotype

Physical expression of the genotype (eg brown eyes)

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12

Dominant

Dominant alleles show up when present (B)

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13

Recessive

Recessive alleles only show up when both alleles are recessive (bb)

Only one recessive is a carrier, typically unaffected (Bb)

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14

Complete dominance

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