Principles of Inheritance and Variation Test

Result

Principles of Inheritance and Variation Test - 52

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The genotype of the individual marked #2 on the pedigree shown could father children with all of the following genotypes except

A
X$$^A$$X$$^a$$

B
X$$^a$$X$$^a$$

C
X$$^A$$X$$^A$$

D
X$$^a$$Y

E
X$$^A$$Y

Solution

X-linked recessive inheritance is a mode of inheritance in which a mutation of gene in X chromosome causes the phenotype to be expressed in males and in females who are homozygous for the gene mutation. The female is homozygous for the recessive phenotpe (X^aX^a). Thus the genes are transmitted to males only in the succeeding generation. Thus the correct answer is option D.
Question 2
1 / -0

The pedigree above represents four generations of a family affected by albinism, an autosomal recessive trait.
What are the genotypes of the parents of individual 2 in generation 2?

A
AA and aa

B
aa and aa

C
Aa and Aa

D
Aa and aa

E
None of the above

Solution

The individual who is affected by albinism has an autosomal recessive trait (aa). The individual 2 in generation 2 is affected, which means the genotype is aa. For the daughter to receive the genotypeaa, one allele is received from mother and one allele is received form father. This means that both the parents must have allele a. But the parents are not affected. So, the genotype of the parents is Aa and Aa. Thus, the correct answer is option C.
Question 3
1 / -0

From the following pedigree chart of a family, one can make an analysis that,

A
It is an autosomal dominant trait

B
It is an autosomal recessive trait

C
It is an allosomal dominant trait

D
It is an allosomal recessive trait

Solution

When neither parents are affected but producing affected offspring then they must be heterozygous and hence this disorder will be autosomal recessive. Such disorder appears more frequently among the children of marriage between closely related individual. Thus, the correct answer is option A.
Question 4
1 / -0

According to Mendel alleles have the following of a character.

A
Pair of genes

B
Responsible for character

C
Production of Gametes

D
Recessive factors
Question 5
1 / -0

Which of the following theory was supported by linkage?

A
Law of independent assortment

B
Theory of linkage

C
Theories for origin of life

D
Both A and B

Solution

When there are genes present on the same chromosome and are inherited together, they are known as linked genes. The theory of independent assortment could not be applied for the linked genes. The theory of linkage supported the phenomenon of linkage. This theory states that when there are genes which are located close to each other on the same chromosome, there are chances that the two genes will always be inherited together.
Thus, the correct answer is option B.
Question 6
1 / -0

The ............ genes are inherited together in all the generations.

A
Linked

B
Dominant

C
Recessive

D
All of the above

Solution

Recombination can occur between any two genes on a chromosome. It is a function of how close the genes are to each other on the chromosome. If two genes are far apart, crossover events will occur with equal frequency. Genes that are closer together or genes which are highly linked undergo no crossing over events and the two genes are inherited together in all the generations.
Thus, the correct answer is option A.
Question 7
1 / -0

According to the chromosomal theory of inheritance, the contrasting pair of genes are known as

A
DNA

B
RNA

C
Proteins

D
Allele

Solution

The chromosomal theory of inheritance was proposed by Mendel. This theory states that there are certain factors which are passed on from one generation to the next in pairs. These factors were later described as the genes. There are two alleles of genes which are present on the homologous chromosomes. One of the alleles is obtained from the mother and the other allele is obtained from the father. These alleles represent the contrasting pair for the same character, like tall and dwarf for character height.
Thus, the correct answer is option D.