Principles of Inheritance and Variation PYQ

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?

With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in $F_3$ generation. 

What is the pattern of inheritance for polygenic trait?

Given below are two statements: Statement I: Failure of segregation of chromatids during cell cycle resulting in the gain or loss of whole set of chromosome in an organism is known as aneuploidy. Statement II: Failure of cytokinesis after anaphase stage of cell division results in the gain or loss of a chromosome is called polyploidy. In the light of the above statements, choose the correct answer from the options given below:

Match List-I with List-II: \begin{array}{llll} List-I & List-II \\Type of Inheritance & Example \\A.Incomplete dominance & I. Blood groups in human \\B.Co-dominance & II. Flower colour in Antirrhinum \\C.Pleiotropy & III. Skin colour in human \\D.Polygenic inheritance & IV.Phenylketonuria\end{array} Choose the correct answer from the options given below:

Match List I with List II : \begin{array}{|l|l|l|l|}\hline & List I & & List II \\\hline A. & Down's syndrome & I. & 11^{\text {th }} chromosome \\\hline B. & \alpha-Thalassemia & II. & 'X' chromosome \\\hline C. & \beta-Thalassemia & III. & 21^{\text {st }} chromosome \\\hline D. & Klinefelter's syndrome & IV. & 16^{\text {th }} chromosome \\\hline\end{array} Choose the correct answer from the options given below :

When a tall pea plant with round seeds was selfed, it produced the progeny of : (a) Tall plants with round seeds and (b) Tall plants with wrinkled seeds. Identify the genotype of the parent plant.

Given below are two statements: Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance. Statement II: In Polygenic inheritance, the effect of each allele is additive. In the light of the above statements, choose the correct answer from the options given below.

Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to : A. Substitution B. Addition C. Deletion D. Translocation E. Inversion Choose the most appropriate answer from the options given below :

Match List I with List II  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, with which of the following genotype will you cross it?

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 characters appear as such in $F_2$ 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:

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

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 $\mathrm{X}$ chromosome. (C) Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females. (D) All eggs bear an additional $\mathrm{X}$ chromosome besides the autosomes. Choose the correct answer from the options given below :

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

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 Langdon 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:

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

The phenomenon of pleiotropism refers to:

A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The $F_1$ plants had yellow seeds and pink flowers. The $F_1$ plants were selfed to get $F_2$ progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the $F_2$ generation?

Match List-I with List-II.  Choose the correct answer from the options given below :

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: