1. The “father” of genetics was
AT. A. Knight. BHans Krebs.
CGregor Mendel. DNone of the above

2. Mendel obtained his P generation by allowing the plants to
Across-pollinate. Bself-pollinate.
Cassort independently. Dsegregate.

3. True-breeding pea plants always
Aproduce offspring each of which can have only one form of a trait.
Bare heterozygous.
Cproduce offspring each of which can have multiple forms of a trait.
Dare pollinated by hand.

4. The first filial (F1) generation is the result of
Aself-fertilization between parental stock.
Bcross-pollination among parents and the next generation.
Ccrosses between the offspring of a parental cross.
Dcrosses between individuals of the parental generation.

5. Which of the following is the designation for Mendel’s original pure strains of plants?
AP1 BP
CF1 DF2

6. The passing of traits from parents to offspring is called
Adevelopment. Bmaturation.
Cheredity. Dgenetics.

7. A genetic trait that appears in every generation of offspring is called
Asuperior. Bdominant.
Crecessive. Dphenotypic.

8. To describe how traits can disappear and reappear in a certain pattern from generation to generation, Mendel proposed
Athe law of segregation.
Bthe law of independent assortment.
Cthe law of genotypes.
Dthat the F2 generation will produce only purple flowers.

9. The law of segregation explains that
Aeach gene of an organism ends up in a different gamete.
Beach gene is found on a different molecule of DNA.
Cdifferent alleles of a gene can never be found in the same organism.
Dalleles of a gene separate from each other during meiosis.

10. The phenotype of an organism
Acannot be seen.
Brepresents its genetic composition.
Coccurs only in dominant pure organisms.
Dreflects all the traits that are actually expressed.

11. An individual heterozygous for a trait and an individual homozygous recessive for the trait are crossed and produce many offspring. These offspring are likely to be
Aof two different phenotypes.
Ball the same genotype.
Cof three different phenotypes.
Dall the same phenotype.

12. Tallness (T) is dominant over shortness (t) in pea plants. Which of the following represents the genotype of a pea plant that is heterozygous for tallness?
ATt Btt
CTT DT

14. A trait that occurs in 450 individuals out of a total of 1,800 individuals occurs with a probability of
A0.75. B0.04.
C0.50. D0.25.

15. How many different phenotypes can be produced by a pair of codominant alleles?
A2 B1
C3 D4

16. 2,000 yellow seeds : 8,000 total seeds ::
A1 : 3 B1 : 4
C1 : 8 D1 : 6

21. What is the expected genotypic ratio resulting from a homozygous dominant ´ heterozygous monohybrid cross?
A1:1 B1:0
C1:2:1 D1:3:1

23. In pea plants, yellow seeds are dominant over green seeds. What would be the expected genotype ratio in a cross between a plant with green seeds and a plant that is heterozygous for seed color?
A1:1 B1:3
C4:1 D1:2:1

24. codominance : both traits are displayed ::
Aheterozygous : alleles are the same
Bprobability : crosses
Chomozygous : alleles are the same
DPunnett square : chromosomes combine

25. What fraction of the offspring resulting from a heterozygous ´ heterozygous dihybrid cross are heterozygous for both traits?
A3/16 B1/16
C1/4 D9/16