Genetics Review

different forms of the same gene

• alleles

• genetics

• phenotype

• genotype

The study of heredity

• alleles

• dominant

• genetics

• zoology

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

having the same alleles for a trait

• heterozygous

• homozygous

• allele

• phenotype

piece of DNA that tells about a specific trait

• chromosome

• tetrad

• codon

• gene

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

the allele form that always expresses itself over another form

• dominant

• recessive

• heterozygous

• homozygous

physical characteristics of an organism

• genotype

• alleles

• phenotype

• homologues

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-3

having different alleles for a trait

• homozygous

• heterozygous

• purebred

• genotype

the specific genes an organism has

• homologues

• tetrads

• phenotype

• genotype

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which best describes Mendel’s law of dominance? (3B1)

• When an organism has two different alleles of the same gene, both genes will be expressed equally in the organism.

• When an organism has two different alleles of the same gene, one of the genes will be expressed and the other will be hidden

• When an organism has two of the same alleles for a gene, that allele is always dominant

• When an organism has two of the same alleles for a gene, the stronger of the two genes will be expressed in the organism

Which of the following represents a heterozygous genotype? (3B1)

• aa

• Ab

• AA

• Aa