Inheritance MCQs

Question 1

In peas, the gene for yellow color (C) is dominant to the gene for green color (c). To determine the genotype of an unknown yellow pea, what kind of pea should you cross with it?

Accepted Answer

Homozygous recessive (cc)

Answer

Another unknown green pea

Answer

Any genotype

Answer

Homozygous dominant

Question 2

Blood group AB can be donated to:

Accepted Answer

AB

Answer

A

Answer

B

Answer

All of the above options are correct

Question 3

The following results of a cross between two individuals shown in the picture are: Which statement describes the children of the cross?

Accepted Answer

Two child is homozygous recessive, and the other exhibits a dominant phenotype but has a parent with a recessive phenotype.

Answer

One child is homozygous dominant, while the other exhibits a dominant phenotype but has a parent with a recessive phenotype.

Answer

One child is homozygous recessive, and the other exhibits a dominant phenotype but has a sibling with a recessive phenotype.

Answer

One child is homozygous recessive, and another exhibits a recessive phenotype, but has a parent with a dominant phenotype.

Question 4

The "d" and "D" alleles are used for lighter and darker skin colour in humans, respectively. By keeping in view the inheritance pattern of skin colour in human beings(controlled by 3 genes), choose which combination shows medium skin colour from the following picture:

Accepted Answer

Column C

Answer

Column A

Answer

Column D

Answer

Column E

Question 5

Phenotype is.

Accepted Answer

The observable physical characteristics or traits of an organism

Answer

The genetic makeup of an organism

Answer

The environmental factors affecting an organism

Answer

The interaction between genotype and environment

Question 6

Dominance is the physiological effect of an allele over its partner allele occupying the;

Accepted Answer

Same locus on respective homologue

Answer

Same locus on same chromosome

Answer

Different locus on same chromosome

Answer

Different locus on respective homologue

Question 7

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY × rryy?

Accepted Answer

Round seeds with yellow cotyledons, and wrinkled seeds with green cotyledons

Answer

Only round seeds with green cotyledons

Answer

Only wrinkled seeds with yellow cotyledons

Answer

Only wrinkled seeds with green cotyledons

Question 8

Haemophilia is more commonly seen in human males than in human females because:

Accepted Answer

This disease is due to a X-­linked recessive mutation.

Answer

A greater proportion of girls die in infancy.

Answer

This disease is due to a Y-­linked recessive mutation.

Answer

This disease is due to an X-­linked dominant mutation.

Question 9

A woman with normal vision, but whose father was color blind, marries a color blind man. Suppose that the fourth child of this couple was a boy. This boy:

Accepted Answer

May be colour blind or may be of normal vision

Answer

Must be colour blind

Answer

Must have normal colour vision

Answer

Will be partially colour blind since he is heterozygous for the colour blind mutant allele

Question 10

Male XX and female XY sometime occur due to:

Accepted Answer

Transfer of segments in X and Y chromosome

Answer

Deletion

Answer

Aneuploidy

Answer

Hormonal imbalance

Question 11

Blood group antigens can be found in:

Accepted Answer

All A, B, C

Answer

R.B.Cs

Answer

Body fluids

Answer

Saliva

Question 12

If Sara has blood group O. The genotype of her mother and father is possible:

Accepted Answer

Bi X Bi

Answer

BB X Bi

Answer

BB X BB

Answer

Both A and C

Question 13

Rh factor is named after:

Accepted Answer

Monkey

Answer

Man

Answer

Rat

Answer

Chimpanzee

Question 14

Red blindness is called:

Accepted Answer

Protanopia

Answer

Deuteranopia

Answer

Tritanopia

Answer

Dichromacy

Question 15

Deuteranopia is:

Accepted Answer

Green blindness

Answer

Blue blindness

Answer

Red blindness

Answer

Color blindness

Question 16

Bombay phenotype is an example of:

Accepted Answer

Epistasis

Answer

Dominance

Answer

Pleiotropy

Answer

Gene linkage

Question 17

Human female differs from human male in having:

Accepted Answer

23 homologous pairs of chromosomes

Answer

22 homologous pairs of chromosomes

Answer

22 homologous pairs of autosomes

Answer

One pair of sex chromosomes

Question 18

Which one is the incorrect statement with regard to the importance of pedigree analysis?

Accepted Answer

It confirms that DNA is the carrier of genetic information

Answer

It helps to understand whether the trait in question is dominant or recessive

Answer

It confirms that the trait is linked to one of the autosomes

Answer

It helps to trace the inheritance of a specific trait

Question 19

A normal-­visioned man whose father was colour­-blind marries a woman whose father was also colour-­blind. They have their first child as a daughter. What are the chances that this child would be colour­-blind?

Accepted Answer

0 %

Answer

100%

Answer

25%

Answer

50%

Question 20

Which one of the following conditions correctly describes the manner of determining the sex?

Accepted Answer

XO type of sex chromosomes determine male sex in grasshoppers

Answer

Homozygous sex chromosomes (ZZ) determine female sex in birds

Answer

XO condition in humans as found in Turner's syndrome, determines female sex

Answer

Homozygous sex chromosomes (XX) produce male in Drosophila

Free Inheritance MCQs with Answers