EASY
Earn 100

What is the skin colour in man an example of?

50% studentsanswered this correctly

Important Questions on Heredity and Variation

EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A gene showing codominance has
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A pleiotropic gene
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A man with blood group A marries a woman having blood group. The maximum possible blood groups among their progenies are
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
If one gene influences many phenotypic traits, the phenomenon is called
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
The genotypes of a Husband and Wife are IA IB and IAi .
Among the blood types of their children, how many different genotypes and phenotypes are possible?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Match the following 

   List - I     List - II
(a) Holandric genes (i) Pleiotropy
(b) Multiple effects of a single gene (ii) Hypertrichosis
(c) Skin colour in man (iii) Multiple Alleles
(d) ABO Blood types (iv) Polygenic inheritance

The correct answer is

HARD
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
In a mating between two mulattos, each heterozygous at all three gene loci for the skin colour, what is the chance their child will have very light skin?
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Choose the correct genotypes of parents, who have 50% of their progeny with B blood group
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following.
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
In a cross between true-breeding (homozygous) red-flowered and true-breeding (homozygous) white flowered plants, the F1 progeny was pink. The phenotypic and genotypic ratios in F2 progency were 1:2:1. This is because of:
MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
The phenomenon where more than two alleles exist in a population of an organism at the same locus on the homologous chromosomes is known as
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
If both parents have AB group, this blood group is not expected in their children.
HARD
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

Study the following statements about the blood groups,
A) The genes for Rh antigen are located on somatic chromosome pair-1.
B) Multiple alleles occupy different loci of homologous chromosomes.
C) The expression of blood types in man is by 3 alleles of a single gene.
D) Blood cells of the foetus are destroyed by Ig G type of antibodies.

From the above, identify incorrect statements.

EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Which one of the following genetic phenomena is represented by the blood group AB?
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
If the genotypes determining the blood groups of a couple are IAI0 and IAIB, then the probability of their first child having type O blood is
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics

The best example for pleiotropy is:

MEDIUM
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Match the terms in Column-I with their description in Column-II and choose the correct option:
 
Column – I Column – II
(a) Dominance (i) Many genes govern a single character
(b) Codominance (ii) In a heterozygous organism, only one allele expresses itself
(c) Pleiotropy (iii) In a heterozygous organism, both alleles express themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters
EASY
Biology>Genetics and Evolution>Heredity and Variation>Deviation from Mendelian Genetics
Multiple alleles are present: