Biology Test 184

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Biology Test 184

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Weekly Quiz Competition

Question 1
4 / -1

What phenotype ratio is obtained by selfing of a trihybrid, in which two gene pairs are completely dominant and one gene pair is incompletely dominant?

A
3 : 6 : 3 : 1 2 : 1

B
27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

C
18 : 6 : 6 : 2 : 9 : 3 : 3 : 1 : 9 : 3 : 3:1

D
18 : 6 : 6 : 2 : 9 : 3 : 3 : 1 : 1 : 2 : 1

Solution

P.R. of trihybrid cross =
Complete Complete Incomplete
dominant dominant dominant
(3:1) (3:1) (1:2:1)
= 18 : 6 : 6 : 2 : 9 : 3 : 3 : 1 : 9 : 3 : 3 : 1
Question 2
4 / -1

Which of the following statement is correct about polygenic inheritance ?

A
In polygenic inheritance one gene regulates the expression of many characters

B
Characters which are regulated by polygenes are qualitative characters

C
Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment

D
Human skin colour is an example of qualitative character
Question 3
4 / -1

Which one of the following option is not related to quantitative inheritance :-

A
Continous pattern

B
Many intermediates

C
Single gene

D
Additive effect of genes
Question 4
4 / -1

Two genes 'A' and 'B' are completely linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aabb). What would be the ratio of offspring in the next generation :-

A
1 : 1 : 1 : 1

B
9 : 3 : 3 : 1

C
3 : 1

D
1 : 1

Solution

(A and B completely linked)
Question 5
4 / -1

A normal vision man whose father is colourblind, marry with a normal woman whose father also colourblind. They have their first child daughter then what are the chances that this child would be colourblind?

A
100%

B
25%

C
0%

D
50%

Solution
Question 6
4 / -1

In an experiment, a plant homozygous for ‘ab’ gene were crossed with wild type. The F₁ hybrid was test crossed and progenies produced in following ratio :

++ / ab → 896 ab / ab → 880
+b / ab → 116 a + / ab → 108
The distance between ‘a’ and ‘b’ gene is :-

A
22.4 cM

B
44 cM

C
11.2 cM

D
45 cM

Solution

Distance between two linked genes =

Parental more and recombinants less in number
Question 7
4 / -1

In Drosophilla, the following recombinations frequencies were found between the given genes :-

a and b = 2.8% a and c = 7.8%
b and d = 8.0% c and d = 3.0%

What is the order of these genes on chromosome?

A
a-b-c-d

B
a-b-d-c

C
b-a-c-d

D
b-a-d-c

Solution
Question 8
4 / -1

Haemophilia is more common in males because it is a :-

A
Dominant trait and gene present on X-chromosome

B
Recessive trait and gene present on Y-chromosome

C
Recessive trait and gene present on X-chromosome

D
Dominant trait and gene present on Y-chromosome
Question 9
4 / -1

Chromosomal theory of inheritance was experimentally verified by :-

A
Sutton and Boveri

B
De Vries

C
Turner

D
Morgan
Question 10
4 / -1

Genetic maps of chromosomes are based on the frequency of :-

A
Non-disjunction

B
Translocation

C
Linkage

D
Genetic recombination