Pre Test

Genotype made of the same allele

• homozygous

• heterozygous

• dominant

• recessive

Answer explanation

The presence of two identical alleles at a particular gene locus is called a homozygous. A homozygous genotype may include two normal alleles or two alleles that have the same variant.

Different forms of genes for a single trait.

• recessive

• allele

• genotype

• phenotype

Answer explanation

An allele is one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

Gene that is always expressed

• homozygous

• recessive

• dominant

• heterozygous

Answer explanation

A dominant allele is a variation of a gene that will produce a certain phenotype, even in the presence of other alleles.

Gene that is expressed only in the homozygous state

• dominant

• recessive

• phenotype

• genotype

Answer explanation

Recessive refers to a type of allele which will not be manifested in an individual unless both of the individual's copies of that gene have that particular genotype.

 Genotype made of two different traits.

• heterozygous

• homozygous

• heterozygote

• allele

Determine which is an example of dominant allele

• D, E, f

• d, E, F

• D, E, F

• d, e, f

Answer explanation

Dominanat allele is represented by big/ capital letter.

Determine which is an example of homozygous dominant.

• AA, KK

• Ll, Mm

• Dd, ff

• BB, vv

Answer explanation

Homozygous dominant are alleles that is the same and is always being expressed. Ex. BB, GG

Which of the following is NOT a recessive allele?

• M, N, o

• e, f, g

• s, t ,u

• a, b ,c

Answer explanation

M, N, o is not a recessive allele because there is a dominant allele in the set of letters.

Which on the following genotype on which dominant allele must show?

• AA, Dd, Rr

• ee, ff, gg

• aa,cc, tt

• dd, ww, qq

Determine which on the following is a homozygous recessive.

• Aa

• EE

• ii

• oO