Questions
A short phase found in between meiosis I and meiosis II during gamete formation is known as
- G1
- M
- interkinesis
- interphase
Colchicine is commonly called mitotic poison because it inhibits
- cell plate formation
- chromosome separation
- DNA replication
- formation of spindle fibres
Chromosomes are smallest in size during
- anaphase
- diakinesis
- metaphase
- zygotene
The nucleosomes
- are present only during mitosis
- consist entirely of DNA
- consist of DNA wound around a histone core
- are made of chromosomes
ABO group of blood in man is an example of
- pleiotropy
- multiple alleles
- polygenes
- incomplete dominance
Dihybrid test cross ratio is
- 1 : 1
- 3 : 1
- 1 : 1 : 1 : 1
- 9 : 3 : 3 : 1
Chromosomal end is known as
- chromomere
- secondary constriction
- telomere
- telocentric
When a red flowered mirabilis is crossed with white one, the hybrids in F1 and F2 were pink flowered. This is due to
- polygenes
- complete dominance
- incomplete dominance
- co-dominance
In F2 generation of a dihybrid cross,
- 4 phenotypes appear in the ratio 9 : 3 : 3 : 1, if the loci are linked
- 4 phenotypes appear in the ratio 9 : 3 : 3 : 1 if the loci are unlinked
- 2 phenotypes appear in the ratio 3 : 1 if the loci are unlinked
- 3 phenotypes appear in the ratio 1 : 2 : 1 if the loci are unlinked
The alkaloid obtained from 'Autumn crocus' is used to induce
- spindle elongation
- polyploidy
- spindle formation
- mitosis
In sickle cell anaemia, the change in amino acid is
- 6th amino acid is valine instead of serine in beta chain
- 6th amino acid is valine instead of glutamic acid in beta chain
- 6th amino acid is valine instead of glutamic acid in alpha chain
- 5th amino acid is valine instead of glutamic acid in alpha chain
The type of sex determination in grasshopper is
- XX - XY
- XX - XO
- ZZ - ZW
- XY - XX
Which of the following mammals does not have teeth?
- Duck billed platypus
- Spiny ant eater
- Mammoth
- None of the above
Which of the following is a sex-linked disorder?
- Down's syndrome
- Turner's syndrome
- Klinefelter's syndrome
- Haemophilia
Genetic make up of an organism is called
- phenotype
- genotype
- alleles
- dominant
In human, the ABO blood groups are determined by a multiple allelic system where IA and IB are co-dominant and dominant to IO. A newborn infant is type A, whose mother is type O. Possible phenotypes of the father are
- A, B or AB
- A, B or O
- O only
- A or AB
The large gap between ischium and pubis is called as
- ischio-illium foramen
- obturator foramen
- ischio-pelvic foramen
- acetabular
Down's syndrome in human is due to
- trisomy of sex chromosome
- trisomy of 11th chromosome
- trisomy of 21st chromosome
- trisomy of 12th chromosome
In cell division, phragmoplasts are concerned with
- cytokinesis
- karyokinesis
- chromosomal movement
- cell elongation
The structure which is not involved in crossing over during meiosis is
- hetereochromatin
- centromere
- chromonemata
- chromomere