Genetics Locus

Alleles are

• nucleotide base pairs

• homozygous and heterozygous

• sequences of DNA that code for a gene

• sequences that code for a phenotype

A genotype is the

• the genetic constitution of an individual organism.

• the genetic codes in chromosomes

• environmental characteristics of an organism

• phenomenon of genotypes

Tags

NGSS.HS-LS1-1

Homozygous alleles means that

• both alleles are identical for a given gene

• both alleles are different for a given gene

• there is one allele for each gene

• genes on each locus are different

Heterozygous alleles means that

• one allele is different for a gene

• both alleles are the same

• the alleles do not code for a gene

• both alleles for a gene are different

Tags

NGSS.HS-LS4-3

Select all the genes below that are homozygous

• Aa

• TT

• gG

• hh

• rR

Select all the genes that are heterozygous

• LL

• Jj

• Hh

• Gb

• TT

In this example, which allele is dominant?

Gg

• G

• Gg

• gg

• g

In codominance, phenotypes of a heterozygous individual are expressed

• simultaneously without any blending

• simultaneously with blending

• simultaneously but symmetrically

• as half dominant and half recessive

In incomplete dominance, a heterozygous individual expresses

• a blend of both traits

• both traits simultaneously

• both traits not mixed

• a new trait as well as both original traits

What is the genotype for the unknown organism?

• Aa

• aa

• AA

• AaA

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2