1. Which of the following is true about the Law of Independent Assortment?

A. It applies to genes on the same chromosome only B. It dictates that genes for different traits inherit independently when on different chromosomes C. It states that dominant traits are more likely to be inherited D. It explains gene mutation rates

2. Which scientist proposed that evolution occurs through the inheritance of acquired traits, a largely incorrect theory?

A. Darwin B. Mendel C. Lamarck D. Watson

3. What does a Punnett square predict?

A. The exact traits offspring will have B. The probability of offspring genotypes and phenotypes C. The environmental influence on inheritance D. How natural selection will act on a population

4. What does "use and disuse" principle refer to?

A. Traits become stronger through inheritance B. Organs used extensively become larger or stronger; unused organs deteriorate C. All mutations increase fitness D. Genes never change during an organism’s life

5. What is the expected genotype ratio in a monohybrid cross between two heterozygous individuals (Aa × Aa)?

A. 1 AA : 2 Aa : 1 aa B. 3 AA : 1 aa C. 1 Aa : 1 aa D. 4 Aa : 0 aa

6. What principle explains that genes for different traits are inherited independently of one another?

A. Law of Segregation B. Law of Dominance C. Law of Independent Assortment D. Genetic Drift

7. Which of these is an example of a phenotype?

A. Genotype FF B. Blue eye color C. Presence of alleles F and f D. Chromosome number

8. Which of the following terms refers to having two identical alleles for a gene?

A. Heterozygous B. Homozygous C. Dominant D. Recessive

9. In a monohybrid cross of two heterozygous pea plants (Pp × Pp), what is the expected phenotypic ratio in offspring for flower color with P = purple and p = white?

A. 1 purple : 3 white B. 3 purple : 1 white C. 2 purple : 2 white D. All purple

10. What does the Punnett square primarily show?

A. Evolutionary relationships between species B. Probabilities of offspring genotypes and phenotypes C. DNA replication fidelity D. Mutation rates in populations

11. How does the Punnett square represent Mendelian segregation?

A. By showing random mutation rates B. By illustrating the separation of alleles into gametes C. By representing natural selection pressures D. By showing gene flow between populations

12. According to Mendel's Law of Segregation, what happens during gamete formation?

A. Alleles of different genes are inherited together B. Alleles separate so each gamete carries only one allele for each gene C. Genes are blended and mixed randomly D. Only the dominant allele is passed on

13. How do mutations contribute to evolution according to the text?

A. They provide the origin of genetic variation B. They always cause harmful traits C. They are eliminated immediately by natural selection D. They produce only recessive alleles

14. What do Mendel's Laws explain?

A. How traits evolve through natural selection B. How traits are passed from parents to offspring C. How species originate D. How DNA is replicated

15. In a monohybrid cross between two heterozygous carriers for cystic fibrosis (Ff × Ff), what is the expected genotypic ratio of the offspring?

A. 100% carriers B. 25% affected, 50% carriers, 25% unaffected non-carriers C. 50% affected, 50% carriers D. 75% affected, 25% carriers

16. Which statement is true about natural selection?

A. It increases the frequency of disadvantageous traits B. It leads to the survival and reproduction of individuals best suited to their environment C. It eliminates all genetic variation D. It results from use and disuse of traits

17. Which of the following is true about natural selection?

A. It causes individuals to develop new traits during their lifetime B. It favors traits that improve survival and reproduction C. It always leads to extinction D. It only affects recessive traits

18. What does the Law of Independent Assortment state?

A. Genes for different traits are inherited together B. Genes for different traits are inherited independently C. Traits are only dominant D. Traits cannot be inherited

19. In a monohybrid cross between heterozygous free earlobes (Ee) and homozygous attached earlobes (ee), what is the expected phenotype ratio?

A. 75% free earlobes, 25% attached earlobes B. 25% free earlobes, 75% attached earlobes C. 50% free earlobes, 50% attached earlobes D. 100% attached earlobes

20. Which of these best describes the Law of Dominance?

A. Two different alleles segregate during gamete formation B. One allele masks the expression of another in a heterozygote C. Genes are inherited independently D. Alleles mutate regularly

21. What is one key piece of evidence for common ancestry among all life on Earth?

A. Differences in DNA coding systems B. Universal genetic code and conserved molecular machinery C. Different metabolic pathways in animals and plants D. Species do not share any genes

22. Which of the following best defines an allele?

A. The physical appearance of an organism B. An alternative form of a gene C. The complete set of genes in an organism D. The process of cell division

23. How does genetics provide a mechanism to explain Darwin's theory of natural selection?

A. It explains how acquired traits are inherited B. It shows how advantageous traits are inherited and spread via genes C. It disproves natural selection D. It predicts the exact future population traits

24. What does the term "heterozygous" mean?

A. Having two identical alleles for a gene B. Having two different alleles for a gene C. Having only dominant alleles D. Having no alleles for a trait

25. What is the relationship between genetics and natural selection in evolutionary theory?

A. They are unrelated fields B. Genetics explains how traits are inherited; natural selection acts on genetic variation C. Natural selection causes mutations in DNA D. Genetics replaces the need for natural selection

26. What does the existence of a universal genetic code across all life forms indicate about evolution?

A. Life evolved independently many times B. All life shares a common ancestor C. DNA is not important for inheritance D. Mutation rates are zero

27. What does phenotype refer to?

A. The DNA sequence of an individual B. Observable traits of an organism C. The genetic makeup of an organism D. The species to which an organism belongs

28. What is represented by the symbol 'P' in Mendelian genetics for pea plants?

A. White flower allele B. Purple flower allele C. Free earlobe allele D. Attached earlobe allele

29. If two cystic fibrosis carriers (Ff × Ff) reproduce, what is the probability their child will be affected by the disease?

A. 50% B. 0% C. 25% D. 75%

30. What is the term for the observable physical or biochemical trait of an organism?

A. Genotype B. Allele C. Phenotype D. Gene

31. What does it mean if an organism is heterozygous for a gene?

A. It has two identical alleles for a gene B. It breaks Mendel's laws C. It has two different alleles for a gene D. It must express the recessive trait

32. What does genotype represent?

A. The physical expression of a gene B. The inherited genetic constitution of an organism C. An acquired characteristic D. A type of mutation

33. What is the genetic foundation for evolution?

A. Lamarck’s inheritance of acquired characteristics B. Mendel’s laws of inheritance C. Fossil record analysis D. Plate tectonics theory

34. What fundamental concept did Gregor Mendel establish through his pea plant experiments?

A. Evolution by natural selection B. Traits are inherited as discrete units called genes C. Inheritance of acquired traits D. Random mutation causes evolution

35. What is the probability that two carriers (Ff × Ff) of cystic fibrosis will have a child who is affected by the disease?

A. 0% B. 25% C. 50% D. 75%

36. What is the outcome of a heterozygous (Ff) × heterozygous (Ff) cross for a recessive genetic disease?

A. 100% affected B. 50% carriers, 25% affected, 25% unaffected non-carriers C. 75% affected, 25% carriers D. 100% carriers

37. Which scientist provided the quantitative experimental foundation for heredity?

A. Lamarck B. Darwin C. Mendel D. Watson

38. What is the phenotype ratio resulting from a monohybrid cross of two heterozygous pea plants (Pp × Pp), where P = purple and p = white?

A. 1 Purple : 3 White B. 3 Purple : 1 White C. 1 Purple : 1 White D. 4 Purple : 0 White

39. Which of the following best describes a recessive allele?

A. Always expressed even if one copy is present B. Expressed only when two copies are present C. Expressed only in heterozygous individuals D. Never expressed

40. According to Lamarck’s theory, how are traits acquired by an organism passed to offspring?

A. Through germline mutations B. Through inheritance of acquired characteristics C. Through random DNA recombination D. Through crossing over during meiosis

41. According to Mendel's Law of Segregation, what happens to alleles during gamete formation?

A. Alleles combine randomly B. Alleles segregate so each gamete carries only one allele C. Alleles disappear D. Alleles change form

42. What is meant by a dominant allele?

A. An allele that is always recessive B. An allele that expresses its phenotype only when two copies are present C. An allele that expresses its phenotype even when only one copy is present D. An allele that is only present in males

43. Which scientist proposed the theory of inheritance of acquired characteristics?

A. Darwin B. Mendel C. Lamarck D. Watson

44. Which of the following is a core principle of genetics according to the material?

A. Only dominant traits can evolve B. Organisms inherit a set of genetic instructions called genes C. Acquired traits are passed to offspring D. Genetic variation does not affect evolution

45. Which of the following is NOT part of Darwin’s four main principles of natural selection?

A. Variation among individuals B. Traits are heritable C. Overproduction of offspring D. Inheritance of acquired traits

46. According to Mendel, what masks the expression of a recessive allele in a heterozygous individual?

A. Mutation B. Independent assortment C. Dominant allele D. Gene linkage

47. How do allele frequencies relate to microevolution?

A. They remain constant over generations B. Changes in allele frequencies in a population over generations represent microevolution C. They only change due to natural disasters D. They increase allele mutation rates

48. What is microevolution?

A. Evolution of new species through large scale changes B. Change in allele frequencies within a population over generations C. Creation of new genes D. Extinction of species

49. What is the primary mechanism of evolution according to Darwin?

A. Genetic drift B. Natural selection C. Mutation D. Gene flow

50. Which of these best describes a recessive allele?

A. Expressed even when only one copy is present B. Expressed only when two copies are present C. Always causes disease D. Dominates over other alleles