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 ?
Answer: Independent assortment
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
Answer: 2 pair & 1 pair
Q3 | If distance between gene on chromosome in more , then gene shows :-
Answer: strong linkage
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.
Answer: Alleles, both of which interact to produce an independent effect in heterozygous condition.
Q5 | A gene located an y - chromosome and therefore, transmitted from father to son is known as
Answer: Supplementary gene
Q6 | In multiple allele system a gamete possesses
Answer: one allele
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
Answer: 3 alleles in which IA and IB are dominant
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
Answer: at the same locus on homologous chromosome
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
Answer: Phenomenon of multiple effect of a simple gene
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
Answer: Either of parent is heterozygous
Q11 | The longer the chromosome of an organism, the more genetic variability it gets from,
Answer: Crossing over
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.
Answer: Knowledge of linkage helps the breeder to combine all desirable traits in a single variety.
Q13 | Genetic balance theory for sex determination in Drosophila was proposed by
Prof. R. P. Roy
H. E. Warmbe
Answer: Mc. Chang
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.
Answer: Female individuals
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.
Answer: Crossing F1 individuals amongst them selves.
Q16 | Segregation of genes take place during which phase of cell division ?
Q17 | A couple has four daughters. The percentage probability of fifth child to be a Daughter is.
Q18 | In human being sex chromosomal complement is
XX - XY
XX - XO
ZO - ZZ
ZW - ZZ
Answer: XX - XY
Q19 | Zea mays has 10 pairs of chromosomes . Linkage groups present in it are
Q20 | Crossing over during meiosis occurs between
Non sister chromatids
Non homologous chromosomes
Answer: Non sister chromatids
Q21 | Incomplete linkage in Drosophila produces off springs with parental and non-parental combinations.State the percentage of non parental combination of Drosophila.
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
Answer: Generation of non- parental gene combination
Q23 | A cross between hybrid and a parent is known as
Answer: Back cross
Q24 | Checkerboard method of calculations was developed by