Mendelian inheritance - laws of inheritance, monohybrid and dihybrid crosses - One Line Questions

1. What is the probability of obtaining a heterozygous offspring (Rr) from a cross between a homozygous dominant parent (RR) and a homozygous recessive parent (rr)? — 1
2. What is the phenotypic ratio observed by Mendel in the F2 generation of a monohybrid cross for a single trait? — 3:1
3. If a trait exhibits complete dominance, what is the phenotypic ratio in the F2 generation of a monohybrid cross between two heterozygotes? — 3:1
4. In a dihybrid cross involving two independently assorting genes, what is the probability of obtaining an offspring with the genotype rryy from parents with genotype RrYy? — 1/16
5. In a monohybrid cross between two heterozygous individuals (e.g., Tt x Tt), what proportion of the offspring are expected to be homozygous dominant? — 1/4
6. If a plant has the genotype RrYy, how many different types of gametes can it produce based on Mendel's principles? — 4
7. The genotypic ratio observed by Mendel in the F2 generation of a monohybrid cross is typically: — 1:2:1
8. What is the characteristic phenotypic ratio observed by Mendel in the F2 generation of a dihybrid cross between plants with genotype RRYY and rryy? — 9:3:3:1
9. A monohybrid cross with incomplete dominance between two heterozygotes would yield which phenotypic ratio in the F2 generation? — 1:2:1
10. A test cross is performed to determine the genotype of an individual exhibiting a dominant phenotype. It involves crossing the individual with: — A homozygous recessive individual
11. Mendel's success was partly due to his careful selection of: — A suitable experimental organism with distinct traits
12. The F1 generation of a dihybrid cross (e.g., RRYY x rryy) typically exhibits: — The dominant phenotype for both traits
13. The first filial (F1) generation in Mendel's monohybrid cross between pure breeding tall (TT) and pure breeding dwarf (tt) plants showed: — All tall plants
14. What is the term for the specific location of a gene on a chromosome? — Locus
15. Mendel's Law of Dominance states that: — In a heterozygous pair, one allele masks the expression of the other.
16. If an allele is present on the X chromosome but not on the Y chromosome, it is considered: — Sex-linked
17. Mendel's experiments demonstrated that inheritance is: — Particulate
18. Who is widely recognized as the 'Father of Genetics' for his pioneering work on pea plants? — Gregor Mendel
19. The concept of 'factors' or 'genes' being passed from parents to offspring, which maintain their identity through generations, was introduced by: — Gregor Mendel
20. An allele whose expression is completely masked by a dominant allele in a heterozygote is termed: — Recessive
21. The Law of Segregation, proposed by Mendel, is based on the observation that: — Factors (alleles) segregate during gamete formation and reunite during fertilization.
22. Gregor Mendel conducted his experiments on which plant species? — Pisum sativum (Garden pea)
23. What is the term for the observable physical characteristics of an organism, such as flower color or seed shape? — Phenotype
24. The Punnett square is a graphical representation used to predict the genotypes of offspring from a cross. It was developed by: — Reginald C. Punnett
25. Which term describes an individual with two identical alleles for a specific gene? — Homozygous
26. In a dihybrid cross, the parental generation genotypes are typically: — Pure breeding for contrasting traits
27. What term describes a pair of genes or alleles that are different for a particular trait? — Heterozygous
28. If the offspring of a test cross show a 1:1 ratio of dominant to recessive phenotypes, the genotype of the parent with the dominant phenotype was: — Heterozygous
29. The P (Parental) generation in Mendel's experiments consisted of: — Pure breeding individuals
30. In incomplete dominance, the heterozygous phenotype is: — An intermediate of the two parental phenotypes
31. Human blood group AB is an example of: — Codominance
32. The reason Mendel's Law of Independent Assortment is not universally applicable is due to: — Linkage
33. Which of Mendel's laws states that during gamete formation, the alleles for each gene segregate independently from each other? — Law of Independent Assortment
34. Which of Mendel's laws is violated if two genes are located very close to each other on the same chromosome? — Law of Independent Assortment
35. In pea plants, Mendel studied the inheritance of seed shape (round vs. wrinkled) and seed color (yellow vs. green). This is an example of a: — Dihybrid cross
36. In a monohybrid cross, Mendel studied the inheritance of how many contrasting traits at a time? — One
37. Codominance is a condition where: — Both alleles in a heterozygote are fully and simultaneously expressed
38. What is pleiotropy? — One gene influencing multiple traits
39. A dihybrid cross involves the study of inheritance of: — Two traits
40. If a trait is controlled by a dominant allele, an individual with which genotype(s) would express that trait? — Homozygous dominant and heterozygous
41. The phenomenon where one gene controls the expression of another gene is known as: — Epistasis
42. An allele that is always expressed when present, masking the effect of a recessive allele, is called: — Dominant
43. In a dihybrid cross, if the alleles for seed shape are R (round) and r (wrinkled), and alleles for seed color are Y (yellow) and y (green), what is the genotype of a plant that is homozygous dominant for both traits? — RRYY
44. The genotype of a plant with wrinkled yellow seeds, assuming independent assortment and standard dominance where R is round and r is wrinkled, Y is yellow and y is green, would be: — rrYY
45. Which of the following is NOT one of the seven traits Mendel studied in pea plants? — Leaf color
46. The alleles for tallness (T) and dwarfness (t) are found on: — Autosomes
47. Mendel's Law of Segregation is analogous to: — The separation of sister chromatids during meiosis II.
48. If 'T' represents the allele for tallness and 't' represents the allele for dwarfness in pea plants, what is the genotype of a homozygous recessive individual? — tt
49. Which of the following crosses would result in offspring with only one type of phenotype if complete dominance is assumed? — TT x tt
50. Mendel's work laid the foundation for understanding genetic variation and inheritance patterns, which is crucial for: — All of the above
All One Line Questions
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