Genetic terms

Alleles

• are alternative forms of the same gene.

• are alternative forms of different genes.

• occupy different loci on homologous chromosomes.

• occupy the same locus on homologous chromosomes.

T and t are alleles to control your tongue rolling ability.

• T and t occupy the same locus on non-homologous chromosomes.

• T and t occupy the same locus on homologous chromosomes.

• T is called the recessive allele of the gene.

• t is called the dominant allele of the gene.

The two chromosomes shown

(1) are homologous chromosomes because they are of the same size and shape.

(2) are non-homologous chromosomes because they have different colours.

(3) carry the same gene at the same locus.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

The two chromosomes shown are non-homologous chromosomes because

(1) they are of different colours.

(2) they are of different sizes.

(3) they are inherited from different parents.

• (1) only

• (2) only

• (3) only

• (1), (2) and (3)

If your genotype for tongue rolling ability is TT, you are

• homozygous dominant.

• heterozygous dominant.

• homozygous recessive.

• heterozygous recessive.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If your genotype for tongue rolling ability is Tt, you are

• homozygous dominant.

• heterozygous dominant.

• homozygous recessive.

• heterozygous recessive.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If your geneotype for a particular character is homozygous, your phenotype is/are

• dominant only.

• recessive only.

• either dominant or recessive.

• neither dominant nor recessive.

It your genotype for a particular character is heterozygous, your phenotype is/are

• dominant only.

• recessive only.

• either dominant or recessive.

• neither dominant nor recessive.

Tongue rolling ability is dominant to non-tongue rolling ability. My genotype for tongue rolling ability is Tt,

• T is the dominant allele for being able to roll the tongue.

• T is the recessive allele for being unable to roll the tongue.

• t is the dominant allele for being able to roll the tongue.

• t is the recessive allele for being unable to roll the tongue.

I am a tongue roller. My possible genotype(s) is/are

• TT only.

• Tt only.

• tt only.

• TT or Tt.