Heredity and Variation Set 1 MCQs

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