Tag: genetics

Quizzes (32) Questions (37)

Questions Related to genetics

Multiple choice pleiotropy genetics zoology

In Drosophila gene for white eye colour is also responsible for depigmentation of body parts. It is an example of

  1. Oncogene

  2. Epistatic gene

  3. Hypostatic gene

  4. Pleiotropic gene

  5. Sex-linked
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ability of a gene to have a multiple phenotypic effects is known as pleiotrophy and the gene is called Pleiotropic gene and the inheritance is called Pleiotropic inheritance. In Drosophila, a gene is responsible in controlling the colour of the eye and depigmentation of body parts. It is a pleiotropic gene.

So, the correct option is ‘Pleiotropic gene’.

Multiple choice pleiotropy genetics zoology

Match the columns and choose the correct option

I II
(a) Dominance (i) Many genes govern a single character
(b) Codominance (ii) In a heterozygous organism only one allele expresses itself
(c) Pleiotropy (iii) In a heterozygous organism both alleles express themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters.

  1. a-iv, b-iii, c-i, d-ii

  2. a-ii, b-i, c-iv, d-iii

  3. a-ii, b-iii, c-iv, d-i

  4. a-iv, b-i, c-ii, d-iii.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

a)Dominance – In a heterozygous organism only one allele express itself

b)Codominance – in a heterozygous organism both alleles express themselves fully

c)Pleiotrophy – A single gene influences many characters.

d)Polygenic inheritance – Many genes govern a single character.

So, the correct option is ‘a-ii b-iii c-iv d-I’.

Multiple choice pleiotropy genetics zoology

Which of the following disorders is not caused by pleiotropic alleles _______________.

  1. Sickle cell anemia

  2. Cystic fibrosis

  3. Phenylketonuria

  4. Erythroblastosis foetalis.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A.Sickel cell anaemia – Pleiotropic alleles

B.Cystic fibrosis – Pleiotropic alleles

C.Phenylketonuria – it is autosomal recessive disorder.

D.Erythroblastosis foetalis – It is also called hemolytic disease of the newborn, type of anemia in which the red blood cells (erythrocytes) of a foetus are destroyed in a maternal immune reaction resulting from a blood group incompatibility between the foetus and its mother.

So, the correct option is ‘Erythroblastosis foetalis’.

Multiple choice pleiotropy genetics zoology

Genes showing multiple effects are

  1. Complementary genes

  2. Pseudogenes

  3. Pleiotropic genes

  4. Cistrons
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A.Complmentary genes - Two genes present on separate loci that interact together to produce a dominant phenotype is called Complementary gene.

B.Pseudogenes – Genomic DNA sequences similar to normal genes but non-functional; they are regarded as defunct relatives of functional genes.

C.Pleiotrophic genes - The ability of a gene to have a multiple phenotypic effects is known as pleiotrophy and the gene is called Pleiotropic gene and the inheritance is called Pleiotropic inheritance. Eg:Sickle cell anaemia.

D.Cistrons – Functional parts of the DNA is called Cistron.

So, the correct option is ‘Pleiotropic genes’.

Multiple choice pleiotropy genetics zoology

Pleiotropic gene has

  1. Multiple genotype

  2. Single genotype

  3. Single phenotype

  4. Multiple phenotype
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ability of a gene to have multiple phenotypic effects or as it influences a number of characters simultaneously is pleiotrophy and the genes are called Pleiotropic genes.

So, the correct option ‘Multiple phenotypes’.

Multiple choice pleiotropy genetics zoology

Pleiotropic effect is found in

  1. Human skin colour

  2. Night blindness

  3. Haemophilia

  4. Sickle cell anaemia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ability of a gene to have a multiple phenotypic effects is known as pleiotrophy and the gene is called Pleiotropic gene and the inheritance is called Pleiotropic inheritance.

eg:Sickel cell anaemia

So, the correct option is ‘sickle cell anaemia’.

Multiple choice pleiotropy genetics zoology

A pleiotropic gene is

  1. $I^A$
  2. $Hb^S$
  3. $Hb^A$
  4. $I^B$.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The gene having multiple phenotypic effects is called pleiotropic genes. Eg: Sickel cell anaemia. This is caused by a gene HbS. When it is a homozygous condition, sickle cell anaemia occurs or if it is in the homozygous condition, act as a carrier.

So, the correct option is 'HbS’