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Flashcards in Chapter4 Lesson 1-3 Deck (20)
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The passing of traits from parents to offspring.

Heredity

1

A specific characteristic that an organism can pass to its offspring through its genes.

Trait

2

The scientific study of heredity.

Genetics

3

The process in sexual reproduction in which an egg cell and a sperm cell join to form a new cell.

Fertilization

4

An offspring of many generations that have the same form of a trait

Purebred

5

A sequence of DNA that determines a trait and is passed from parent to offspring.

Gene

6

The different forms of a gene.

Alleles

7

An allele whose trait always shows up in the organism when the allele is present.

Dominant allele

8

An allele that is hidden whenever the dominant allele is present

Recessive alleles

9

An offspring of crosses that has two different alleles for a trait

Hybrid

10

A number that describes how likely it is that a particular event will occur.

Probability

11

A chart that shows all the possible combinations of alleles that can result from a genetic cross.

Punnet square

12

An organism’s physical appearance, or visible traits.

Phenotype

13

An organism’s genetic makeup, or allele combinations.

Genotype

14

Having two identical alleles for a particular gene.

Homozygous

15

Having two different alleles for a particular gene.

Heterozygous

16

A situation in which one allele is not completely dominant over another allele.

Incomplete dominance

17

A situation in which both alleles for a gene are expressed equally.

Codominance

18

Three or more possible alleles of a gene that determine a trait.

Multiple alleles

19

The inheritance of traits that are controlled by two or more genes, such as height in humans.

Polygenic inheritance