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Genetics Terms

Total questions: 25

Worksheet time: 13mins

Name
Class
Date
1.

Factors that control traits are called

a)

Genes

b)

Purebred

c)

Recessives

d)

Parents

2.

Scientists call an organism that has two different alleles for a trait a

a)

Hybrid

b)

Trait

c)

Purebred

d)

Factor

3.

What does the notation TT mean to geneticists?

a)

at least one dominant allele

b)

one dominant and one recessive allele

c)

two dominant alleles

d)

two recessive alleles

4.

What does the notation Tt mean to geneticists?

a)

two recessive alleles

b)

two dominant alleles

c)

Purebred

d)

one dominant allele and one recessive allele

5.

An organism’s physical appearance is its

a)

Genotype

b)

Dominant

c)

Recessive

d)

Phenotype

6.

What is a mutation?

a)

any change that is harmful to an organism

b)

any change in a gene or chromosome

c)

any change that is helpful to an organism

d)

any change in the phenotype of a cell

7.

The different forms of a gene are called

a)

Factors

b)

Alleles

c)

Masks

d)

Traits

8.

What does the notation tt mean to geneticists?

a)

two dominant alleles

b)

two recessive alleles

c)

at least one dominant allele

d)

one dominant and one recessive allele

9.

An organism that has two identical alleles for a trait is

a)

codominant

b)

tall

c)

homozygous

d)

heterozygous

10.

A heterozygous organism has

a)

three different alleles for a trait.

b)

two identical alleles for a trait.

c)

.only one allele for a trait.

d)

two different alleles for a trait.

11.

Cloning results in two organisms that are

a)

both adult mammals.

b)

produced from cuttings.

c)

genetically similar.

d)

genetically identical.

12.

No two people have the same DNA, except for

a)

crime suspects.

b)

brothers

c)

sisters

d)

identical twins.

13.

Which of the following genotypes are homozygous? Check all that apply.

a)

Bb

b)

AA

c)

Gg

d)

RR

14.

Which of the following genotypes are heterozygous? Check all that apply.

a)

EE

b)

FF

c)

Bb

d)

Tt

15.

If purple flowers are dominant to white flowers, which of the following genotypes will be purple? Check all that apply.

a)

PP

b)

Pp

c)

pp

16.

When two alleles in a pair are different (Bb or Mm) they are called

a)

homozygous

b)

heterozygous

c)

trait

d)

genotype

17.

When two alleles in a pair are the same (BB or bb) they are called

a)

heterozygous

b)

gamete

c)

homozygous

d)

zygote

18.

Different forms of a gene are called

a)

recessive

b)

dominant

c)

gametes

d)

alleles

19.

The allele masked by the dominant one

a)

gamete

b)

recessive

c)

zygote

d)

cross-fertilization

20.

The "stronger" of two alleles expressed

a)

dominant

b)

recessive

c)

gamete

d)

gene

21.

An organism's genetic makeup (consisting of 2 alleles), represented as letters (Yy or YY) is called the

a)

genotype

b)

phenotype

c)

gene

d)

allele

22.

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.

a)

TT

b)

Tt

c)

tt

d)

RR

23.

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.

a)

RR

b)

Tt

c)

rr

d)

Rr

24.

How many chromosomes are found in each cell of your body (excluding gametes)?

a)

46

b)

23

c)

40

d)

45

25.

Sex cells only contain half as many chromosomes as your body cells.

a)

True

b)

False