Mendel's Laws of Heredity

Q. What is the genotypic ratio obtained when a tall plant with smooth seeds (TtSS) is crossed with a dwarf plant with wrinkled seed (ttss)?

1. TTSS:ttss = 1:4
2. ttSS:ttss = 2:3
3. TtSs:ttss = 1:2
4. TtSs:ttSs = 1:1

Q. The gametes produced in F1 generation of Mendel’s dihybrid cross between yellow round seeds & green wrinkled seeds are:

1. Yr, yR
2. Y, y, R, r
3. Yy, Rr
4. YR, yr

Q. What were the benefits of selecting pea plant in Mendel's experiments?

1. Well defined characters
2. Presence of bisexual flowers
3. Shorter life cycle
4. Presence of unisexual flowers

Q. Which of the following traits were studied by Mendel for his experiments on pea plants?

1. Shape of the pod
2. Position of the flower
3. Shape of the seed
4. Colour of the pod

Q. A monohybrid cross between heterozygous tall pea plant and homozygous dwarf pea plant produced $F_1$ generation with genotypic ratio G and phenotypic ratio P. Find G and P

1. G = 1:1, P = 1:1
2. G = 3:1, P = 1:2:1
3. G = 1:2:1, P = 3:1
4. G = 2:1, P = 1:1

Q. How many different phenotypes and genotypes are obtained in Mendel’s ${\text{F}}_2$ generation of dihybrid cross?

1. 4 phenotypes and 9 genotypes
2. 4 phenotypes and 16 genotypes
3. 2 phenotypes and 16 genotypes
4. 16 phenotypes and 8 genotypes

Q. Set of observable characteristics in an organism is called phenotype.

1. True
2. False

Q. In Mendel’s experiments, the ${\text{F}}_1$ progeny resembles either of the two parents. The character that was not visible in this generation was:

1. Recessive
2. Dominant
3. Wild
4. Superior

Q. Recessive characters are expressed in both homozygous and heterozygous state.

1. True

2. False

Q. The phenotypic ratio obtained in the ${\text{F}}_2$ generation for a dihybrid cross between round yellow seeds and green wrinkled seeds is:

1. 9:3:3:1
2. 9:3:3:3
3. 9:5:3:1
4. 9:3:4:3