Lab 15:Human Mendelian genetics Flashcards Preview

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Flashcards in Lab 15:Human Mendelian genetics Deck (11):
1

A heritable feature of an organism that varies among individuals, features such as flower color in Mendel's peas or freckles in humans.

Character

2

A variety or state of a character, such as a white flower color in peas or no freckles on a human.

Trait

3

The functional unit of heredity. It is found at particular locations on the chromosome, and the nucleotide sequence determines the primary structure of all polypeptides and proteins.

Structural gene

4

An alternative form of a gene which occurs at the same location on homologous chromosomes.

Allele

5

The actual alleles present for a given gene homologous chromosomes. Expressed in letters.

Genotype

6

The outward expression of a genotype, or what the trait looks like externally, or physically.

Phenotype

7

A genotype with the same alleles for a gene on homologous chromosomes.

Homozygous

8

A genotype with different alleles for a gene on homologous chromosomes.

Heterozygous

9

The allele expressed in a phenotype when a genotype is heterozygous.

Dominant allele

10

The allele not expressed in the phenotype when the genotype is heterozygous. Only expressed when the genotype is homozygous.

Recessive allele

11

A genetic condition which occurs when neither allele is dominant over another, but both are expressed in the phenotype.

Codominant