Principles of Inheritance and Variation

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

In a testcross involving F1 dihybrid flies, more parental – type offspring were produced than the recombinant – type offspring. This indicates:

Pick out the correct statements: (i) Hemophilia is a sex – linked recessive disease (ii) Down's syndrome is due to aneuploidy (iii) Phenylketonuria is an autosomal recessive gene disorder (iv) Sickle cell anaemia is an autosomal recessive gene disorder

A true breeding plant is

The mechanism that causes a gene to move from one linkage group to another is called

Which of the following most appropriately describes hemophilia?

Match the following: Column – I (a) Dominance (b) Codominance (c) Pleiotropy (d) Polygenic inheritance Column – II (i) Many genes govern a single character (ii) In a heterozygous organism only one allele expresses itself (iii) In a heterozygous organism both alleles express themselves fully (iv) A single gene influences many characters

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in:

Among the following characters, which one was not considered by Mendel in his experiments on pea?

A normal cell of an organism has a gene which codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

A disease caused by an autosomal primary non-disjunction is

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Which one from those given below is the period for Mendel's hybridization experiments?

The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

Select the correct match.

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

Which of the following characteristics represent 'Inheritance of blood groups' in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance

Which of the following pairs is wrongly matched?

The production of gametes by the parents, the formation of zygotes, the F1 and F2 plants, can be understood using

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:

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:

In a marriage between male with blood group A and female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of parents?

In which genetic condition, each cell in the affected person, has three sex chromosomes XXY?

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants can be understood from a diagram called

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

Crossing over takes place between which chromatids and in which stage of the cell cycle?

Match the items of column I with column II: Column I: (a) XX-XO method of sex determination (b) XX-XY method of sex determination (c) Karyotype-45 (d) ZW-ZZ method of sex determination Column II: (i) Turner's syndrome (ii) Female heterogametic (iii) Grasshopper (iv) Female homogametic Select the correct option from the following:

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

Experimental verification of the chromosomal theory of inheritance was done by

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

Persons with “AB” blood group are called as “Universal recipients”. This is due to:

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?

XO type of sex determination can be found in

The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

Given below are two statements: Statement I : Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance. Statement II : Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height. In the light of the above statements, choose the correct answer from the options given below:

Which of the following occurs due to the presence of an autosome linked dominant trait?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Mendel’s law of Independent assortment does not hold goods for the genes that are located closely on the same chromosome. Reason (R): Closely located genes assort independently. Answer from the options given below:

A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F1 plants had yellow seeds and pink flowers. The F1 plants were selfed to get F2 progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the F2 generation?

Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. A. It is an example of female heterogamety. B. Male produces two different types of gametes either with or without X chromosome. C. Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. D. All eggs bear an additional X chromosome besides the autosomes. Choose the correct answer from the options given below:

The phenomenon of pleiotropism refers to

In which disorder change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine?

Which of the following symbols represents mating between relatives in human pedigree analysis?

A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?

Select the correct statements about sickle cell anaemia. A. There is a change in gene for beta globin. B. In the beta globin, there is valine in the place of Lysine. C. It is an example of point mutation. D. In the normal gene U is replaced by A. Choose the correct answer from the options given below:

Match List-I with List-II. List-I (Type of cross): A. Monohybrid Cross B. Dihybrid Cross C. Incomplete dominance D. Test Cross List-II (Phenotypic ratio): I. 1 : 1 II. 1 : 2 : 1 III. 3 : 1 IV. 9 : 3 : 3 : 1 Choose the correct answer from the options given below:

Frequency of recombination between gene pairs on some chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

Broad palm with single palm crease is visible in a person suffering from

Which of the following statements are correct about Klinefelter's Syndrome? A. This disorder was first described by Landon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also expressed. C. The affected individual is short statured. D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile. Choose the correct answer from the options given below:

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

In a plant, black seed color (BB/bb) is dominant, over white seed color (bb). In order to find out the genotype of the black seed plant, which of the following genotype will you cross it?

As per ABO blood grouping system, the blood group of father is B+, mother is A+ and child is O+. Their respective genotype can be A. IBi / IAi / ii B. IBIB / IAIA / ii C. IAIB / iIA / iBi D. IAi / IBi / IAi E. iIB / iIA / IAIB Choose the most appropriate answer from the options given below.

Match List I with List II: List I A. Down's syndrome B. α-Thalassemia C. β-Thalassemia D. Klinefelter's syndrome List II I. 11th chromosome II. 'X' chromosome III. 21st chromosome IV. 16th chromosome Choose the correct answer from the options given below:

Match List I with List II. List I A. Two or more alternative forms of a gene B. Cross of F1 progeny with homozygous recessive parent C. Cross of F1 progeny with any of the parents D. Number of chromosome sets in plant. List II I. Back cross II. Ploidy III. Allele IV. Test cross Choose the correct answer from the options given below.

Which one of the following can be explained on the basis of Mendel's law of Dominance? A. Out of one pair of factors one is dominant and the other is recessive. B. Alleles do not show any expression and both the character appear as such in F2 generation. C. Factors occur in pairs in normal diploid plants. D. The discrete unit controlling a particular character is called factor. E. The expression of only one of the parental characters is found in a monohybrid cross. Choose the correct answer from the options given below:

Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?

What is the pattern of inheritance for polygenic trait?

What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for 'A' and 'B' blood group, respectively?

Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes. Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes. Choose the correct answer:

Assertion A: In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf. Reason R: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive. Choose the most appropriate answer:

Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?

Which of the following statements are true with reference to the sex-determination in honeybees? A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker). B. An unfertilized egg develops as a male by parthenogenesis. C. A male has half the number of chromosomes than that of a female. D. Males produce sperms by meiosis. E. Honeybees have a haplodiploid sex-determination system. Choose the correct answer from the options given below :

Match List I with List II : List-I A. Incomplete dominance B. Co-dominance C. Pleiotropy D. Polygenic inheritance List-II I. Human skin colour II. Inheritance of flower colour in Antirrhinum sp. III. Phenylketonuria disease in humans IV. ABO blood groups Choose the correct answer from the options given below :

In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are ______.

The sixth mutant codon of beta globin gene causing polymerization of Haemoglobin and change in RBC shape is ______.

For a person with blood group 'O', which of the following is not a possible combination of parents' blood-group genotypes?