Morgan's Experiments on Crossing Over

Q.

The ratio 9:3:3:1 represents:

1. Mendel’s dihybrid phenotypic ratio

2. Mendel’s monohybrid phenotypic ratio

3. Mendel’s monohybrid genotypic ratio

4. Mendel’s dihybrid genotypic ratio

Q.

When does the segregation of mendelian factor take place?

Q. What does the line signify that "Genetic material must be able to express itself in the form of mendelian characters"?

Q. Mendel's monohybrid phenotypic ratio of 3:1 proves:

1. Dominance
2. Segregation
3. Crossing-over
4. Independent assortment

Q. Which of the following characters were considered by Morgan for his linkage and crossing over experiments

1. Body colour
2. Wing size
3. Eye colour
4. Wing colour

Q.

In Morgan's experiments on linkage, the percentage of white - eyed, miniature winged combinations in F2 generation is

a.) 1.3

b.) 37.2

c.) 62.8

d.) 73.2

e) 98.7

Q. Which of the following statements is incorrect with respect to studies on linkage?

I. Morgan was the first to report linkage based on his studies on Drosophila.
II. Morgan observed that the two genes segregate independently of each other and the $F_2$ phenotypic ratio is 9:3:3:1.
III. Morgan coined the term ‘recombination’ to describe the physical association of genes on a chromosome.
IV. Bateson and Punnett were the first to report linkage based on their studies on Lathyrus odoratus.

1. I and III only
2. I, II, and III
3. II, III, and IV
4. II and IV only

Q.

Mendels law of segregation is also known as?

Q.

Are eyes color and hair color multiple alleles?

Q. Select the number of incorrectly matched pair(s):
$\begin{array}{ccc}& \text{Column I}& \text{Column II}\\ \text{1.}& \text{Father of genetics}& \text{Erich Von Tschermak}\\ \text{2.}& \text{Pea plant}& \text{Bisexual flowers}\\ \text{3.}& \text{Characters studied in}& \text{7 pairs}\\ & \text{pea plants by Mendel}& \end{array}$

1. 2 only
2. 1 only
3. 1 and 2 only
4. 1 and 3 only

Q.

What does Mendel’s law of segregation state?

Q. Jumping genes in maize were discovered by

1. Hugo de Vries
2. Barbara McClintock
3. T. H Morgan
4. Mendel

Q. Mendel’s law of segregation states that :-

1. the two factors for the same trait separate in the product
2. the two different traits will be inherited independently of each other
3. the gametes are produced by meiosis
4. All of the above

Q. From the results Mendel got from his crossing experiments, he mentioned some discrete units were involved in passing down from one generation to another. What did he call those units?

1. Genes
2. Alleles
3. Traits
4. Factors

Q.

State Mendels law of segregation?

Q. Which of the following characters were considered by Morgan for his linkage and crossing over experiments

1. Body colour
2. Wing size
3. Eye colour
4. Wing colour

Q. The term 'linkage' was coined by.

1. T.H. Morgan
2. T. Boveri
3. G. Mendel
4. W. Sutton

Q. Select the number of incorrectly matched pair(s):
$\begin{array}{ccc}& \text{Column I}& \text{Column II}\\ \text{1.}& \text{Father of genetics}& \text{Erich Von Tschermak}\\ \text{2.}& \text{Pea plant}& \text{Bisexual flowers}\\ \text{3.}& \text{Characters studied in}& \text{7 pairs}\\ & \text{pea plants by Mendel}& \end{array}$

1. 2 only
2. 1 only
3. 1 and 2 only
4. 1 and 3 only

Q. The term ‘linkage’ was first coined by

1. T. H. Morgan
2. T. Boveri
3. G. Mendel
4. W. Sutton

Q. Genic balance theory holds good in case of.

1. Humans
2. Drosophila
3. Grasshopper
4. Allium cepa

Q. Blending theory was replaced by particulate theory of _______.

1. Mendel
2. Kolreuter
3. Darwin
4. Gaertner

Q. Individual homozygous ab genes were crossed with wild type (++) in Drosophila. The F1 hybrid produced were test crossed. The progenies produced were:
++ = 900
ab = 600
+a = 115
+b = 105
Calculate the recombination frequency for a and b genes:

1. 10MU
2. 11MU
3. 12MU
4. 13MU

Q. Given below are different statements regarding Mendel’s experiment on garden pea. Which of the statements explains why he failed to observe linkage?

1. Genes of the traits selected by Mendel were located on four different chromosomes and behaved independently
2. Genes selected by him were discrete and stable
3. All the genes for seven characters were located on seven non-homologous chromosomes
4. Pea plant does not show linkage

Q. Mendel's monohybrid phenotypic ratio of 3:1 proves:

1. Dominance
2. Segregation
3. Crossing-over
4. Independent assortment

Q.

State Mendels Law of segregation.

Q. The genes for the eye colour and size of the wing in Drosophila are located on the same chromosome. They can be separated/ recombinants develop due to

1. Non-disjunction
2. Crossing over
3. Hybridization
4. Not be separated at any stage

Q. Select the incorrect pair(s):

	Category I	Category II
1.	Father of genetics	Erich Von Tschermak
2.	Pea plant	Bisexual flowers
3.	Characters studied in pea plants by Mendel	7 pairs

1. 2 only
2. 1 only
3. 1 and 2 only
4. 1 and 3 only

Q. Linkage in Drosophila was first discovered by

1. Mendel
2. Bateson and Punnet
3. Morgan
4. Bridges

Q. Q Write the Mendels laws of inheritance.
Q Discuss the causes of cancer.

Q. Which of the following characters were considered by Morgan for his linkage and crossing over experiments

1. Body colour
2. Wing size
3. Eye colour
4. Wing colour