On This Page
This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Heredity and Variation Set 1
Q1 | If there were only parental combinations in F2 of a dihybrid cross then Mendel might have discovered ?
- Independent assortment
- Atavism
- Linkage
- Repulsion
- cessive
Q2 | Medelian dihybrid and dihybrid with linkage are respectively related with how many chromosomes?
- 1 pair & 2 pair
- 2 pair & 1 pair
- 2 pair & 2 pair
- 1 pair & 1 pair In dihybrid with linkage , 2 pairs of genes located in similar homobgous chromosomes
- cessive
Q3 | If distance between gene on chromosome in more , then gene shows :-
- Less Linkag
- strong linkage
- weak linkage
- incomplete linkage
- cessive
Q4 | Which of the following conditions represent a case of co- dominant genes ?
- A gene expresses itself , suppressing the phenotypic effect of its alleles.
- enes that are similar in phenotypic effect when present separately, but when together interact to produce a different trait.
- Alleles, both of which interact to produce effect in homozygous condition
- Alleles, both of which interact to produce an independent effect in heterozygous condition.
- cessive
Q5 | A gene located an y - chromosome and therefore, transmitted from father to son is known as
- Supplementary gene
- Complementary gene
- Duplicate gene
- Holandric gene
- cessive
Q6 | In multiple allele system a gamete possesses
- 2 alleles
- 3 alleles
- one allele
- several alleles
- cessive
Q7 | Blood grouping in humans is controlled by
- 4 alleles in which IA is dominant
- 3 alleles in which IA and IB are dominant
- 2 alleles in which none is dominant
- 3 alleles in which IA is recessive
- cessive
Q8 | Muliple alleles are present
- in different chromosomes
- at different loci on chromosomes
- at the same locus on homologous chromosome
- at the non homologous chromosome
- cessive
Q9 | what is called pleiotropism ?
- Phenomenon of multiple effect of a simple gene
- Phenomenon of multiple effect of multiple genes
- Phenomenon of multiple effect of multiple alleles
- all of the above
- cessive
Q10 | In a family, father has a blood group 'A' and mother has a blood group 'B', Children show 50 % probability for a blood group "AB" indicate that -
- Father is heterozygous
- Mother is heterozygous
- Either of parent is heterozygous
- Mother is homozygous
- cessive
Q11 | The longer the chromosome of an organism, the more genetic variability it gets from,
- Independent assortment
- Linkage
- Crossing over
- Mutation.
- cessive
Q12 | Which statement is incorrect about linkage ?
- It helps in maintaining the valuable traits of new varieties.
- It helps in forming new recombinants.
- Knowledge of linkage helps the breeder to combine all desirable traits in a single variety.
- It helps in locating genes on chromosome.
- cessive
Q13 | Genetic balance theory for sex determination in Drosophila was proposed by
- Prof. R. P. Roy
- H. E. Warmbe
- C.B. Bridges
- Mc. Chang
- cessive
Q14 | In Bonellia all larva are genetically and cytologically similar. In this worm mole individuals live inthe uterus of female. If a particular larva settle near proboscis of an adult female, it becomes a male individuals. Larva develops free in water it becomes.
- Male individuals
- Female individuals
- Inter Sex
- Super female
- cessive
Q15 | F2 generation is produced as a result of
- Crossing F1 individuals with dominant parent
- Crossing F1 individuals with recessive parent
- Crossing one of the parental individual with dominant individual.
- Crossing F1 individuals amongst them selves.
- cessive
Q16 | Segregation of genes take place during which phase of cell division ?
- Metaphase
- Anaphase
- prophase
- Embryo formation
- cessive
Q17 | A couple has four daughters. The percentage probability of fifth child to be a Daughter is.
- 10
- 50
- 75
- 100
- cessive
Q18 | In human being sex chromosomal complement is
- XX - XY
- XX - XO
- ZO - ZZ
- ZW - ZZ
- cessive
Q19 | Zea mays has 10 pairs of chromosomes . Linkage groups present in it are
- 5
- 10
- 20
- 40
- cessive
Q20 | Crossing over during meiosis occurs between
- sister chromatids
- Non sister chromatids
- Centromeres
- Non homologous chromosomes
- cessive
Q21 | Incomplete linkage in Drosophila produces off springs with parental and non-parental combinations.State the percentage of non parental combination of Drosophila.
- 83%
- 17%
- 15%
- 85%
- cessive
Q22 | What does the term recombination describe ?
- Generation of non- parental gene combination
- Generation of parental gene combination
- Generation of internal gene combination
- All of the above
- cessive
Q23 | A cross between hybrid and a parent is known as
- Test cross
- Back cross
- Monohybrid cross
- Reciprocal cross
- cessive
Q24 | Checkerboard method of calculations was developed by
- Mendel
- Bateson
- punnett
- Morgan
- cessive
Q25 | Punnet square is used to know
- outcome of a cross
- probable result of a cross
- Types of gametes
- Number of gametes
- cessive