Variation and genetics – Online MCQs Test – Biology MCAT

1. The multiple effects of a single gene or allele are termed:

Test Cross

Epistasis

Co dominance

Pleiotropy

2. The polygenic character is:

Diabetes

Round/wrinkle

Human height

Tall/dwarf

3. None of the two genes is dominant over the other, this phenomenon is:

Co-dominance

Epistasis

Incomplete dominance

Test Cross

4. A gene for a trait having three or more allelic forms is called:

Unilocular alleles

Single allele

Double alleles

Multiple alleles

5. Suppressive influence of any genetic factor on another that is not its allele is:

Incomplete Dominance

Co dominance

Epistasis

Test Cross

6. Cross fertilization of a phenotypically dominant individual with a homozygous recessive individual is:

Co-dominance

Test cross

Epistasis

Incomplete dominance

7. Blood group A can be donated to:

All of the above

8. Type II Diabetes Mellitus usually occurs after about age:

9. Test cross is a cross between

Two F1, hybrids

F1 hybrid with dominant parent

F1 hybrid with recessive parent

None of these

10. Mendel’s hereditary factor “genes” are located on:

Chromosomes

Lysosomes

Nuclear membrane

Mitochondria

11. Number of Autosomes present in humans:

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

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

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

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

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

13. Phenotype is:

The genetic make-up of an individual

The same for parent and offspring

Not observable

The appearance of an individual

14. Rh stands for:

Rhesus Factor

Rhesus Heamatin

Rhesus Gene

Rhesus Pool

15. The allele that masks the effects of the other and the masked allele are known as:

Homozygous, heterozygous

Dominant, incomplete

Dominant, recessive

Homozygous, recessive

16. Blood group, also known as “UniversaI Donor” is:

Blood group O+

Blood group B-

Blood group AB+

Blood group A+

17. 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

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

Homozygous dominant

Heterozygous dominant

Heterozygous

Homozygous recessive

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

Gene target

Gene cycle

Gene square

Gene pool

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

aabb x AABB

AaBb x AaBb

AaBb x aabb

aabb x aabb

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