Q.1.
on Q151) Genotype is

Explanation

Q.2.
on Q152) Which among the following statements are correct? (i) Strength of linkage is directly proportional to distance between the genes. (ii) Number of parental gamete is directly proportional to strength of linkage. (iii) Number of recombinant gamete is directly proportional to distance between genes. (iv) Reason for the occurrence of recombinants in the case of linkage is crossing over.

Explanation

Q.3.
on Q153) Frame shift mutation occurs when:

Explanation

Q.4.
on Q154) In a given DNA segment ATGACCAGGACCCCAACA, the first base gets mutated through silent substitution. The effect of this on coding by this DNA segment will result in

Explanation

Q.5.
on Q155) Select the statements that describe characteristics of genes. (i) Genes are specific sequence of bases in a DNA molecule. (ii) A gene does not code for proteins. (iii) In individuals of a given species, a specific gene is located on a particular chromosome. (iv) Each chromosome has only one gene.

Explanation

Q.6.
on Q156) Cri-du-chat syndrome in humans is caused by

Explanation

Q.7.
on Q175) In a pea plants, green pod colour is dominant over yellow pods. 1000 seeds taken from a pea plant on germination produces 760 green pod and 240 yellow pod plants. The parental genotype and phenotype of the seed plant are

Explanation

Q.8.
on Q157) How many of the following are true regarding Haemophilia? (i) It is due to the mutation of R – allele of a gene. (ii) Heterozygous genotype in male will be a carrier. (iii) Disease will be expressed only in the homozygous condition of the respective gene. (iv) Disease is easily expressed in males. (v) Haemophilia is due to the absence of some proteins necessary for blood clotting.

Explanation

Q.9.
on Q158) Which among the following pairs correlating the genetical terms and proponents are wrongly matched?

Explanation

Q.10.
on Q159) In Morgan’s experiments on incomplete linkage, the percentage of recombinants in F2 generation is:

Explanation

Q.11.
on Q160) If fruit weight in a plant was measured and following categories were obtained- 25g; 30g; 35g; 40g; 45g; 50g; 55g.Then, how many genes are involved for controlling fruit weight?

Explanation

Q.12.
on Q161) Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary in nature. Suppose T stands for dominant gene and t for recessive gene, the genetic makeup of a person who cannot taste is

Explanation

Q.13.
on Q162) When two genes are situated very close to each other in a chromosome

Explanation

Q.14.
on Q163) Round seed trait (R) is dominant over wrinkled (r) seed trait in Pea. Heterozygous round seeded plant (Rr) is crossed with wrinkled seed plant (rr). What is the possible progeny?

Explanation

Q.15.
on Q164) Identify the incorrect statement:

Explanation

Q.16.
on Q165) When the two genes in a dihybrid cross are situated on the same chromosome:

Explanation

Q.17.
on Q166) Two phenotypically normal individuals have an affected child. What can we conclude about the parents?

Explanation

Q.18.
on Q167) Thalassemia and sickle-cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Explanation

Q.19.
on Q168) Match the terms in Column I with their description in Column II and choose the correct option.
Column I Column II
A. Dominance Many genes govern a single character
B. Co dominance Ina heterozygous organism only one allele expresses itself
C. Pleiotropy In a heterozygous organism both alleles express themselves fully
D. Polygenic inheritance A single gene influences many characters

Explanation

Q.20.
on Q169) Fruit colour in squash is an example of

Explanation

Q.21.
on Q170) Select the correct statement from the ones given below with respect to dihybrid cross.

Explanation

Q.22.
on Q171) Inheritance of skin colour in humans is an example of:

Explanation

Q.23.
on Q172) Cri-du-chat syndrome in humans is caused by the:

Explanation

Q.24.
on Q173) An inherited character and its detectable variant is termed as

Explanation

Q.25.
on Q174) If a homozygous red-flowered plant is crossed with a homozygous white-flowered plant, the offspring’s will be

Explanation

Q.26.
on Q178) A true-breeding plant line can be obtained by

Explanation

Q.27.
on Q179) Which of the following genotype express gametes?

Explanation

Q.28.
on Q180) Lack of independent assortment of two genes A and B in fruit fly – Drosophila is due to:

Explanation

Q.29.
on Q181) Statement 1: In sickle cell anaemia the point mutation is called transversion. Statement 2: In this case, adenine is replaced by thymine.

Explanation

Q.30.
on Q182) If a diploid cell is having the chromosome arrangement AABBCCDD, which among the change after mutation is not a type of aneuploidy?

Explanation

Q.31.
on Q183) Which of the following is a monohybrid?

Explanation

Q.32.
on Q184) Co-dominance refers to the condition where F1

Explanation

Q.33.
on Q185) Disorder caused by the trisomy of chromosome number 21

Explanation

Q.34.
on Q186) Find correct match
Column I Column II
i. Down’s syndrome a. Broad palm with characteristic palm crease
ii. Klinefelter’s syndrome b. Gynaecomastia
iii. Turner’s syndrome c. rudimentary ovaries
- -   - - d. XO
- -   - - e. XXY
- -   - - f. physical development is retarded.

Explanation

Q.35.
on Q187) In guinea pigs, black coat colour is a dominant trait and white is a recessive trait. When heterozygous black pigs are intercrossed the chance of the first two offspring being black is:

Explanation

Q.36.
on Q188) In peas, a tall, yellow-seeded plant is crossed with a homozygous short, green-seeded plant. The numbers of progeny are: 203 [tall, green-seeded plants], 199 [short, green-seeded plants], 207 [tall, yellow-seeded plants] and 192 [short, yellow-seeded plants]. The most likely genotype of the tall, yellow-seeded parent is:

Explanation

Q.37.
on Q189) Which of the following statement is correct with respect to human sex determination?

Explanation

Q.38.
on Q190) Which of the following disorder is associated with Queen Victoria?

Explanation

Q.39.
on Q191) Sex determination in Honey bee depends upon-

Explanation

Q.40.
on Q192) If two parents with AaBBccdd and aaBbccdd were crossed. What is the probability of getting following genotypes? AABB and aabb

Explanation

Q.41.
on Q193) The genes which are involved in alpha Thalassemia are---- and ----- while in beta Thalassemia are----.

Explanation

Q.42.
on Q194) Read the following statement and choose the correct option: (i) In Phenylketonuria the affected person does not secrete an enzyme to convert tyrosine to phenyl alanine. (ii) The possibility of a female becoming haemophilic is possible. (iii) Sickle cell anaemia is caused by the substitution of glutamic acid by valine at the fifth position of β – chain of haemoglobin molecule. (iv) Myotonic dystrophy is an autosomal dominant trait.

Explanation

Q.43.
on Q195) Which among the following years of importance in genetics is wrongly matched?

Explanation

Q.44.
on Q196) The dominant alleles A and B each add 2 g weight to a basal weight (in homozygous recessive condition) of 6g of fruits of a certain plant. If two plants, each with fruits weighing 8g and having heterozygous condition for one gene each are crossed, what phenotypic ratio is expected among the offspring?

Explanation

Q.45.
on Q197) Which one of the followings is not correct for Huntington disease ________?

Explanation

Q.46.
on Q198) Edward's syndrome, Patau's syndrome and Down's syndrome are due to

Explanation

Q.47.
on Q200) Which Mendelian cross can produce two genotypes and two phenotypes?

Explanation

Q.48.
on Q201) Which of the following is not a recessive trait considered by Mendel?

Explanation

Q.49.
on Q202) Assertion: Mendelian disorders are because of gene mutation and problematic genes are always present on sex chromosomes. Reason: Haemophilia, Sickle – cell anaemia and Phenylketonuria are Mendelian disorders which are due to the mutation of dominant alleles of genes.

Explanation

Q.50.
on Q203) Genotype - Phenotype concept was first produced by

Explanation