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Genetics Review

Test Description: Review of Punnett Squares, Pedigrees, Genetics Disorders, and Vocabulary Terms

Instructions: Answer all questions to get your test result.

1) When sex cells combine to produce offspring, each sex cell will contribute

Ahalf the number of chromosomes Bthe normal number of chromosomes Cone fourth the number of chromosomes

2) An allele in which a trait always shows up when the allele is present is called

Aincomplete dominance Brecessive Ccodominant Ddominant

3) Chromosomes are made up of

Acells Bmany traits joined together Cmany genes joined together DRNA

4) What does the notation Bb mean to geneticists?

Aone dominant and one recessive allele Bhomozygous alleles Ctwo dominant alleles Dtwo recessive alleles

5) An organism's physical appearance is its

Aphenotype Bgenotype Chomozygous Dheterozygous

6) What is a mutation?

Aany change that is helpful to an organism Bany change in a gene or a chromosome Cany change that is harmful to an organism

7) Why are sex-linked traits more common in males than in females?

AAll alleles on the X chromosome are dominant BA recessive allele on the X chromosome will always produce the trait in a male CAll alleles on the Y chromosome are recessive

8) A purebred chicken with white feathers is crossed with purebred chicken that has black feathers. Each of their offspring have both black and white feathers. Why does this happen?

AThe alleles are both dominant BSeveral alleles work together to determine the trait CThe alleles are both recessive DThe alleles are an example of incomplete dominance

9) Genetic disorders are caused by

ADNA mutations or changes in chromosomes Bpedigrees Cdominant alleles only Drecessive alleles only

10) A carrier is a person who has

Atwo recessive alleles Btwo unknown alleles Ctwo dominant alleles for a trait Done dominant allele and one recessive allele for a trait

11) An organism with two identical alleles for a trait is called a(n)

Ahybrid Bphenotype Cheterozygous Dpurebred

12) Which combination of sex chromosomes results in a male human being?

AYY BXX Ceither XX or YY DXY

13) What is a pedigree?

Aa chart that tracks which members of a family have a particular trait Ba geneticist who studies the inheritance of traits in humans CA tool used to show genotypes and phenotypes of future offspring Da picture of all the chromosomes within a cell

14) Factors that control traits are called

Aalleles Bpurebred Cgenes Dhybrid

15) The passing of physical characteristics from parents to offspring is known as

Aheredity Bchromosomes Cgenes Dgenetics

16) An organism's genotype is its

Atrait Bfeather color Cphysical appearance Dgenetic makeup

17) Many characteristics are affected by interactions between genes and

Acarriers Bpedigrees Cthe environment Dalleles

18) Sex-linked genes are genes found on

Athe Y chromosome only Bboth the X and Y chromosomes Call 23 pairs of chromosomes Dthe X chromosome only

*select an answer for all questions

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