Warm-Up #14 4/1/131) What is the probability of getting a heads when

you flip a coin?

2) Give an example of someone who is a hybrid( use the letter T).

3) If a family has a recessive disease, what would the genotype for someone who has a ½ shaded box or circle on a pedigree (use the letter B)?

4) List the genotypes for A blood.

5) How many chromosomes are pictured below?

Unit 8Mendelian Genetics

Pre-Test Review Questions

Number your own paper to 23

1) Gregor Mendel used pea plants to study

• A -flowering.

• B-gamete formation.

• C-the inheritance of traits.

• D-cross-pollination

2) The principle of dominance and recessiveness states that

• A-all alleles are dominant.

• B-all alleles are recessive.

• C -some alleles are dominant and others are recessive.

• D -alleles are neither dominant nor recessive

3) When you flip a coin, what is the probability that it will come up tails?

• A 1/2

• B 1/4

• C 1/8

• D 1

4) Organisms that have two identical alleles for a particular trait are said to be

• A hybrid.

• B homozygous.

• C heterozygous.

• D dominant.

5) Variations in human skin color is an example of

• A incomplete dominance.

• B codominance.

• C polygenic traits.

• D multiple alleles.

6) A Down Syndrome individual possesses Trisomy Nondisjunction. They have how many copies of chromosome 21?

• A 0

• B 1

• C 2

• D 3

7) A male and female bison that are both heterozygous for normal skin pigmentation (Aa) produce an albino offspring (aa). What was the probability that the offspring would be albino?

• A 1/4• B 1/2• C 1/3• D 1/16

8) In the P generation, a purebred tall plant (TT) is crossed with a homozygous short plant (tt). The probability that an F1 plant will be tall is

• A 25%.• B 50%.• C 75%.• D 100%.

9) The results of crossing a red snapdragon with a white snapdragon are all PINK offspring. This demonstrates the principle of

• A mutation.

• B incomplete dominance.

• C codominance.

• D recessivness.

10) Predict the OUTCOME of a cross between a heterozygous white-furred animal(Ww) and a homozygous brown-furred animal(ww)

• A 100% hybrid• B 100% brown-furred• C 50% white, 50% brown• D 50% heterozygous brown, 50%

heterozygous white

11) Situations in which one allele for a gene is not completely dominant over another allele for that gene are called

• A multiple alleles.

• B incomplete dominance.

• C polygenic inheritance.

• D multiple genes.

12) The passing of TRAITS from one generation to the next is called

• A dominance

• B heredity

• C maturation

• D development

13) A HETEROZYGOUS individual would have the genotype

• A Dd

• B DD

• C dd

• D DDD

14) The chemical factors that determine traits are called

• A water.

• B traits.

• C genes.

• D characters.

15) An organism’s PHENOTYPE

• A Cannot be observed

• B Represents its genetic composition

• C Represents all the traits that are actually expressed; what you see

• D Occurs only in dominant homozygous organisms

16) A Punnett square shows all of the following EXCEPT

• A all possible results of a genetic cross.• B the genotype of the offspring.• C the gender of the possible children in

the cross• D how traits are passed on from one

generation to the next.

17) Offspring that result from crosses between parents with different traits

• A are true-breeding.

• B make up the F2 generation.

• C make up the parental generation.

• D are called hybrids.

18) Which of the following genotypes result in the same phenotype or blood type?

• A IAIA and IAIB

• B IBIB and IBi

• C IBIB and IAIB

• D IBi and ii

19) In a pedigree, a circle represents a(an)

• A male.

• B female.

• C child.

• D adult.

20) Colorblindness is more common in males than in females because

• A fathers pass the allele for colorblindness to their sons only.

• B the allele for colorblindness is located on the Y chromosome.

• C the allele for colorblindness is recessive and located on the X chromosome.

• D males who are colorblind have two copies of the allele for colorblindness.

21) How many chromosomes are shown in a normal human karyotype?

• A 2

• B 22

• C 44

• D 46

22) Hybrid: heterozygous as purebred: _____________.

• A horses

• B homozygous

• C haploid.

• D incomplete.

23) What percentage of human sperm cells carry an X chromosome?

• A 0%

• B 25%

• C 50%

• D 100%

Review Question Answers

1) C

2) C

3) B

4) B

5) C

6) D

7) A

8) D

9) B

10) C

11) B12) B13) A14) C15) C16) C17) D18) B19) B20) C21) D22) B23) C