Mendel's Monohybrid Experiments

Q.

Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modern name for these factors?

Q.

Cytological evidence to Mendel’s law of segregation can be observed in

1. Anaphase-II

2. Anaphase-I

3. Metaphase-II

4. Metaphase-I

Q.

Mendel conducted his breeding experiments on __________.

1. Pisum sativum

2. Triticum aestivum

3. Felis catus

4. Musca domestica

Q.

What is the law of dominance of traits? Explain with an example.

Q.

What we know today as genes were what Mendel called as _________.

1. Vectors

2. Vehicles

3. Carriers

4. Factors

Q. What are alleles.

Q.

What genes are recessive?

Q. State the three laws of inheritance given by Mendel.

Q. The year 1900 AD is highly significant for geneticists due to

1. Discovery of genes
2. Principle of linkage
3. Chromosome theory of heredity
4. Rediscovery of Mendelism

Q.

Label the parts indicated by numbers in the following diagrammatic representation of Watson and Crick model of DNA.

1. a
2. b
3. c
4. d

Q.

State the three Mendel's laws of inheritance.

Q.

How many types of gametes are produced by the parents of Mendel’s monohybrid $F_2$ progeny?

1. Two

2. Four

3. One

4. Three

Q.

In the pea plant, purple colour of flower is dominant over white colour. Progeny obtained by crossing pure purple flowered plants with white flowered plants are self-pollinated. The resulting plants produced are:

1. All purple flowered plants.

2. Purple flowered plants and white flowered plants in a 3 : 1 ratio.

3. Purple flowered and white flowered plants in equal numbers.

4. All white flowered plants.

Q. On which plant Mendel performed his experiments?

Q. What will be the phenotypic ratio in the offsprings obtained from the following crosses. (Note : Gene A is dominant over gene a)
(a) $Aa\times$aa (b) $AA\times aa$

Q.

Genes were called_________by Mendel.

1. Factors

2. Carriers

3. Vectors

4. Vehicles

Q. What is the ratio of one pair of contrasting characters in F${}_2$ of a dihybrid cross?

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

Q. A dihybrid plant on self pollination produced 400 phenotypes with 9 types of genotype. How many seeds will have genotype TtRr?

1. 200
2. 100
3. 50
4. 150

Q. A pure tall plant can be differentiated from a hybrid tall plant

1. By measuring length of plant
2. By spraying gibberellins
3. If all plants are tall after self pollination
4. If all plants are dwarf after self pollination

Q. A cross between AaBB x aaBB yields a genotypic ratio of

1. 1 AaBB : 1 aaBB
2. 1 AaBB : 3 aaBB
3. 3 AaBB : 1 aaBB
4. All AaBb

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

A) 4 phenotypes and 9 genotypes
B) 4 phenotypes and 16 genotypes
C) 16 phenotypes and 8 genotypes
D) 2 phenotypes and 16 genotypes

Q.

Rewrite and complete the following sentences by inserting the correct word in the space indicated:

Q. Mendel crossed tall and rounded seeds with short and wrinkled, in F${}_2$ generation he saw 1/16 were short and wrinkled seeds, What did he conclude from this?

1. Short and wrinkled show linkage.
2. They show independent assortment.
3. Tall and wrinkled never combine.
4. None of the above.

Q. In sweet peas, genes C and P are necessary for colour in flowers. The flowers are white in the absence of either or both the genes. What will be the percentage of coloured flowers in the offspring of the cross Ccpp x ccPp?

1. 75%
2. 100%
3. 25%
4. 50%

Q.

Today's genes are Mendel’s ___.

1. Vectors

2. Vehicles

3. Factors

4. Carriers

Q. Which of the following points further strengthened Mendelism?

1. Law of independent assortment which based on monohybrid cross
2. Law of independent assortment which could be stated on the basis of segregation of gametes
3. A character controlled by a pair of unit factors
4. Incomplete dominance gave a new way to mendelism

Q.

Mendel conducted his breeding experiments on __________.

1. Musca domestica

2. Pisum sativum

3. Triticum aestivum

4. Felis catus

Q. Write the phenotypic and genotypic ratios of Mendel's cross-pollination experiments in pea plants with heterozygous yellow seeds $\left(Y_y\right)$ with that of the same type, i.e., $Y_y$.

Q. What is the probability of homozygous plants for both dominant characters in F${}_2$ generation of a dihybrid cross?

1. 3/16
2. 9/16
3. 4/16
4. 1/16

Q. Genotype of male plant is $S_2{S}_3$ while of female plant is $S_1{S}_2$ .Which of the following pollen grain is compatible for the stigma of given female plant

1. $S_1$
2. $S_3$
3. $S_1,S_3$
4. $S_2$