Variation and genetics – Online MCQs Test – Biology MCAT

1. Locus is a:

Partner of gene

Part of DNA

None of the above

Position of gene

2. The-part of DNA which controls a specific character is

Factor

Locus

Gene

Allele

3. The tendency of genes in a chromosome to remain together is called:

Synapsis

Linkage

Crossing over

Pleiotropy

4. Genes A and B are necessary for normal hearing. A deaf man marries a deaf woman and all their children have normal hearing. The genotypes of the parents are:

aaBB and aaBB

AAbb and Aabb

Aabb and aaBb

AAbb and aaBB

5. The ratio for law of independent assortment is:

0.125694444444444

0.0430671296296296

9:3:3:1

0.377094907407407

6. The phenotypic ratio of plants with dominant character to those with recessive character is always close to:

3:1

0.0423611111111111

0.0840277777777778

0.0430555555555556

7. Mendel’s law of segregation states that.

All of the above

Gametes are produced by meiosis

Two different traits will be inherited independently of each other

Two factors for the same trait separate in the production of gametes

8. Incomplete dominance is also known as:

Primary Inheritance

Intermediate inheritance

Dependent Inheritance

Secondary Inheritance

9. Which of the following condition represents a case of co-dominant genes?

Genes that are similar in phenotypic effect, when present separately, but when together interact to produce different unit

Alleles, each of which produces an independent effect in a heterozygous condition

A gene expresses itself suppressing the phenotypic effect of its alleles, when present in Heterozygous condition.

Alleles both of which interact to produce a trait which mayor may not resemble either of the parental types

10. Number of chromosomes present in Male Grasshopper:

?23

11. It test cross gives 5O% dominant and 50% recessive characters it means the parent is:

Heterozygous

Heterozygous dominant

Homozygous recessive

Homozygous dominant

12. Which of the following is an example of a dihybrid cross?

aabb x aabb

AaBb x AaBb

aabb x AABB

AaBb x aabb

13. The total aggregate of genes in a population at any one time is called the populations

Gene square

Gene cycle

Gene target

Gene pool

14. The sex-linked genes are present In a significant way on:

X chromosomes

Autosomes

Ychromosomes

Homologous chromosomes

15. Cross appearance of intermediate character is known as:

Epistasis

Co dominance

Incomplete dominance

Test cross

16. In Erythroblastosis foctalis:

Mother is Rh positive and father Rh negative

Father is Rh positive and mother Rh negative

Mother and father both are Rh negative

Mother and father are both Rh positive but grand parents are Rh negative

17. Traits that are controlled by two or more than two separate pairs of genes, which manifest themselves in an additive fashion to yield continuously varying traits, this is:

Polygenic Inheritance

Pleiotropy

Intermediate Inhertiance

Epistasis

18. One of the x chromosomes of a woman bears two linked genes for haemophillic and colour blindness. She marries a normal man. How will the progeny be?

All sons and daughters are haemophillic and colour-blind

50% haemophillic daughters and 50% colour blind daughters

Haemophillic colour-blind daughters

50% haemophillic colour-blind sons and 50% normal sons

19. The position of gene is:

Gene

Locus

Allele

Factor

20. The physiological effect of an allele over its partner allele on locus is called:

Pleiotropy

Bombay phenotype

Dominance

Epistasis

Variation and genetics / inheritance-Medical College Admission Test Preparation Notes