WorksheetsGenetics Terms
Total questions: 25
Worksheet time: 13mins
Factors that control traits are called
Genes
Purebred
Recessives
Parents
Scientists call an organism that has two different alleles for a trait a
Hybrid
Trait
Purebred
Factor
What does the notation TT mean to geneticists?
at least one dominant allele
one dominant and one recessive allele
two dominant alleles
two recessive alleles
What does the notation Tt mean to geneticists?
two recessive alleles
two dominant alleles
Purebred
one dominant allele and one recessive allele
An organism’s physical appearance is its
Genotype
Dominant
Recessive
Phenotype
What is a mutation?
any change that is harmful to an organism
any change in a gene or chromosome
any change that is helpful to an organism
any change in the phenotype of a cell
The different forms of a gene are called
Factors
Alleles
Masks
Traits
What does the notation tt mean to geneticists?
two dominant alleles
two recessive alleles
at least one dominant allele
one dominant and one recessive allele
An organism that has two identical alleles for a trait is
codominant
tall
homozygous
heterozygous
A heterozygous organism has
three different alleles for a trait.
two identical alleles for a trait.
.only one allele for a trait.
two different alleles for a trait.
Cloning results in two organisms that are
both adult mammals.
produced from cuttings.
genetically similar.
genetically identical.
No two people have the same DNA, except for
crime suspects.
brothers
sisters
identical twins.
Which of the following genotypes are homozygous? Check all that apply.
Bb
AA
Gg
RR
Which of the following genotypes are heterozygous? Check all that apply.
EE
FF
Bb
Tt
If purple flowers are dominant to white flowers, which of the following genotypes will be purple? Check all that apply.
PP
Pp
pp
When two alleles in a pair are different (Bb or Mm) they are called
homozygous
heterozygous
trait
genotype
When two alleles in a pair are the same (BB or bb) they are called
heterozygous
gamete
homozygous
zygote
Different forms of a gene are called
recessive
dominant
gametes
alleles
The allele masked by the dominant one
gamete
recessive
zygote
cross-fertilization
The "stronger" of two alleles expressed
dominant
recessive
gamete
gene
An organism's genetic makeup (consisting of 2 alleles), represented as letters (Yy or YY) is called the
genotype
phenotype
gene
allele
In pea plants, short plants (t) are recessive to tall plants (T). Which of the following genotypes would result in a tall plant? Check all that apply.
TT
Tt
tt
RR
In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following genotypes would result in a wrinkled plant? Check all that apply.
RR
Tt
rr
Rr
How many chromosomes are found in each cell of your body (excluding gametes)?
46
23
40
45
Sex cells only contain half as many chromosomes as your body cells.
True
False
