Ch. 20 Homework Flashcards Preview

Human Biology > Ch. 20 Homework > Flashcards

Flashcards in Ch. 20 Homework Deck (11):
1

The term ______ refers to the outward expression of a trait, either physically, microscopically, or metabolically.

Phenotype

2

This is determined by which ______ their chromosomes possess for a specific trait.

Alleles

3

The combination of alleles of an organism is referred to as the organism's ______.

Genotype

4

For diploid organisms, each cell contains ______ alleles for each trait, referred to as the dominant and recessive alleles.

Two

5

If an organism possesses two dominant alleles, the term ______ ______ can be used to describe its genotype, and it will exhibit a dominant phenotype.

Homozygous dominant

6

If, however, it possesses two recessive alleles, the term ______ ______ can be used to describe its genotype, and it will exhibit a recessive phenotype.

Homozygous recessive

7

The term ______ ______ can be used to describe the genotype of an organism that possesses one dominant and one recessive allele, and this individual will still express a dominant phenotype.

Heterozygous dominant

8

Skin color and height are examples of polygenic traits that are controlled by ______ sets of alleles.

Several

9

Polygenic traits are graphically represented as a ______ curve.

Bell-shaped

10

In polygenic inheritance, ______ alleles all code for product and have a ______ effect on phenotype.

Dominant; quantitative

11

The effects of polygenic inheritance are additive and result in a ______ ______ of phenotypes.

Continuous variation