Inheritance MCQs

Question 1

MN blood group system is an example of:

Accepted Answer

Co-dominance

Answer

Complete dominance

Answer

Incomplete dominance

Answer

Overdominance

Question 2

Freshly released human egg has:

Accepted Answer

One X chromosome

Answer

One Y chromosome

Answer

Two X chromosomes

Answer

One X ­chromosome and one Y­ chromosome

Question 3

A chromosome have two genes X and Y. Gene Y influences the phenotypic effect of gene X.Based on the influential phenotypic effect, the gene Y is:

Accepted Answer

Epistatic to gene X.

Answer

Linked to gene X

Answer

Hypostatic to gene X.

Answer

Independent of gene X for its expression

Question 4

It is observed that pea plants with white flowers have colourless seed coats and leaf axils. This shows that the gene for flower colour affects more than one characteristics.The given observation exemplifies the:

Accepted Answer

Pleiotropic inheritance

Answer

Epistatic inheritance

Answer

Polygenic inheritance

Answer

Incomplete dominance

Question 5

In horses, black colouring (B) is dominant and chestnut colouring (b) is recessive. A homozygous black horse crosses with a chestnut horse.The percentage of offspring that are expected to be chestnut is:

Accepted Answer

0%

Answer

25%

Answer

50%

Answer

75%

Question 6

In dogs, black coat colour (B) is dominant over yellow coat colour (b), and straight fur (C) is dominant over curly fur (c).In a cross between two BbCc parents, the predicted fraction of offspring with black coat colour and straight fur would be:

Accepted Answer

9/16

Answer

3/4

Answer

1/4

Answer

1/16

Question 7

The given pedigree shows the inheritance of earlobe shape in a family. The allele for free earlobes (F) is dominant to the allele for attached earlobes (f).What is the probability of the next child from the same parents having free earlobes?

Accepted Answer

50 %

Answer

0 %

Answer

25 %

Answer

75 %

Question 8

In cats, the allele (B) for black tabby fur is dominant over the allele (b) for chocolate tabby fur.The total number of kittens produced by the given cross are 8.The number of kittens with black tabby fur will be:

Accepted Answer

6

Answer

2

Answer

3

Answer

8

Question 9

In pea plants, the allele of inflated pod shape (I) is dominant over constricted pod shape (i) and the allele of yellow pod colour (Y) is dominant over green pod colour (y).If 112 offspring are produced by this cross, then out of these the number of offspring with constricted green pods would be

Accepted Answer

7

Answer

14

Answer

28

Answer

56

Question 10

When two heterozygotes (AaBb) of completely dominant traits are crossed, then the probability of appearance of AABB genotype would be:

Accepted Answer

1/16

Answer

3/16

Answer

6/16

Answer

9/16

Question 11

An example of epistasis is:

Accepted Answer

Gene E hides the effect of coat colour gene in dogs

Answer

Human height is controlled by 180 genes

Answer

Human blood groups are determined by three alleles

Answer

The gene for flower colour in pea plants also affects the seed coat colour

Question 12

The given diagram of separation of alleles during gamete formation examples the:

Accepted Answer

Mendel's law of independent assortment

Answer

Sex-linked inheritance

Answer

Inheritance of a single trait

Answer

Hardy-Weinberg principle

Question 13

The patient with sickle cell anaemia has red blood cells with an abnormal form of hemoglobin.The gene for haemoglobin exists in two forms:HN= dominant allele for normal hemoglobin.Hs= recessive allele for abnormal hemoglobin.If 50% of the children of a couple have sickle cell anaemia,then the genotype of the couple would be:

Accepted Answer

HNHs,HS HS

Answer

HNHN ,HN HN

Answer

HNHN,HS HS

Answer

HNHs,HNHS

Question 14

Consider the given cross between two cats.The probability of the offspring cats produced by this cross would be:

Accepted Answer

50% black long-haired and 50% black short-haired

Answer

100% black long-haired

Answer

75% black long-haired and 25% black short-haired

Answer

25% black long-haired and 75% black short-haired

Question 15

In a pea plant, the yellow seed colour (Y) is dominant over the green seed colour (y) and smooth texture of seed (S) is dominant over wrinkled seed (s). The gametes produced by a heterozygous pea plant with yellow seed colour and smooth texture would be:

Accepted Answer

YS, Ys, yS, ys

Answer

Yy, Ss

Answer

Y, y, S, s

Answer

Yy, YY, SS, ss

Question 16

A couple has blood group A and B, respectively. The blood group of their son is AB and the daughter has blood group O.The parents and the children have four different genotypes for the same trait because the:

Accepted Answer

Blood type is controlled by multiple alleles

Answer

Blood type is produced by the cumulative effect of many genes

Answer

Alleles of blood group are not expressed as dominant or recessive

Answer

Inheritance of blood group follows the laws of Mendelian genetics

Question 17

The given diagram shows a mutation in a single gene of β-globin of hemoglobin affecting multiple organs that causes different health issues. Based on the effects shown, the beta-globin gene is categorized as a/an:

Accepted Answer

Pleiotropic gene

Answer

Epistatic gene

Answer

Recessive gene

Answer

Hypostatic gene

Question 18

The punnet square that CORRECTLY represents a dihybrid cross between two heterozygous RrYy × RrYy pea plants with round yellow seeds is:

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 19

Consider the given cross between pure breeding yellow round and green wrinkled seeds of pea plants.If total 568 pea plants are produced in the F2 generation, then the possible number of pea plants with green round seeds (yyRr) would be:

Accepted Answer

106

Answer

35

Answer

71

Answer

279

Question 20

Consider the given monohybrid cross between pure breeding pea plants with green and yellow seeds.If total 76 pea plants are produced in the F2 generation, then the number of pea plants with yellow seeds would be:

Accepted Answer

57

Answer

19

Answer

38

Answer

75

Free Inheritance MCQs with Answers