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Flashcards in Chapter 7 Deck (13)
1

recessive trait

a trait that reappears in the second generation after disappearing in the first generation when parents with different traits are bred.

2

dominant trait

the trait observed in the first generation when parents that gave different traits are bred.

3

Gene

one set of instructions for an inherited trait.

4

allele

one of the alternative forms of a gene that governs a characteristic, such as hair color.

5

phenotype

an organism's appearance or other detectable characteristic.

6

genotype

the entire genetic makeup of an organism; also the combination of genes for one or more specific traits.

7

probability

the likelihood that a possible future event will occur in any given instance of the event.

8

Punnett square

a diagram used to organize all the possible combination of genes for one or more specific traits.

9

homologous chromosome

chromosomes that have the same sequence of genes and the same structure.

10

meiosis

a process in cell division during which the number of chromosomes decreases to half the original number by two divisions of the nucleus, which results in the production of sex cells.

11

sex chromosome

one of the pair of chromosomes that determine the sex of an individual.

12

pedigree

a diagram that shows the occurrence of a genetic trait in several generations of a family.

13

heredity

the passing of traits from parents to offspring.