Q.1.
on Q204) what is called pleiotropism ?

Explanation

Q.2.
on Q205) In Bonellia all larva are genetically and cytologically similar. In this worm mole individuals live inthe uterus of female. If a particular larva settle near proboscis of an adult female, it becomes a male individuals. Larva develops free in water it becomes.

Explanation

Q.3.
on Q206) Klinefelter's syndrome is developed when the chromosome in male is

Explanation

Q.4.
on Q207) A colour-blind man marries the daughter of a colour-blind person. In their progeny

Explanation

Q.5.
on Q208) Which of the following is a recessive trait for a character chosen by Mendel in garden pea?

Explanation

Q.6.
on Q209) A couple has a daughter. What is the probability that their next child will be a daughter?

Explanation

Q.7.
on Q210) A female whose father was colour-blind marries and normal male whose father was also colour-blind. What is the probability that their daughter will be colour-blind?

Explanation

Q.8.
on Q211) If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

Explanation

Q.9.
on Q212) The incorrect statement with regard to haemophilia is

Explanation

Q.10.
on Q213) ABO blood groups in humans are controlled by the gene I. It has three alleles — IA, IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Explanation

Q.11.
on Q214) Which one of the following is the most suitable, medium for culture of Drosophila melanogaster?

Explanation

Q.12.
on Q215) Which of the following chromosomal disorders is the commonest in the new borns?

Explanation

Q.13.
on Q216) The ratio in a dihybrid test cross between two individuals is given by

Explanation

Q.14.
on Q217) Which of the following is true for a recessive disease in family A and B?
unit-7_ch-2_que_no-217_img_no1.png

Explanation

Q.15.
on Q218) A pea plant parent having violet-coloured flowers with unknown genotype was crossed with a plant having white-coloured flowers. In the progeny, 50% were white. The genotypic constitution of the parent having violet-coloured flowers was

Explanation

Q.16.
on Q219) For how many years Gregor Mendel conducted hybridisation experiments on garden peas?

Explanation

Q.17.
on Q220) What is the cause of variation?

Explanation

Q.18.
on Q221) Mendel’s principle of segregation means that the germ cells always receive:

Explanation

Q.19.
on Q222) Which among the following is an inborn error in metabolism?

Explanation

Q.20.
on Q223) In a true breeding tall or dwarf pea variety the possible set of allelic pair(s) of genes for height are

Explanation

Q.21.
on Q241) Phenotypic ratio 3:1 proves

Explanation

Q.22.
on Q224) ABO blood grouping provides an example of (i) co-dominance (ii) Multiple allelism (iii) Incomplete dominance

Explanation

Q.23.
on Q225) What does Blending inheritance refers to?

Explanation

Q.24.
on Q226) What will be the ratio of homozygous dominant, homozygous recessive and pure heterozygous traits in F2 generation in pea plant is

Explanation

Q.25.
on Q227) In a cross between AABB X aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be:

Explanation

Q.26.
on Q228) Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:

Explanation

Q.27.
on Q229) Sickle cell anaemia is a classic example of

Explanation

Q.28.
on Q230) If a haemophilic female who marries a normal male gives birth to a male child, then what are the chances of boy being normal? (a hypothetical situation but it won’t happen practically)

Explanation

Q.29.
on Q231) Sickle cell anaemia is caused by

Explanation

Q.30.
on Q232) What is the characteristic feature of haplodiploid sex determination?

Explanation

Q.31.
on Q233) if two brown eyed people marry each other and each one had one blue eyed parent. What is the proportion of eye colour in their offspring?

Explanation

Q.32.
on Q234) Fruit fly is excellent model of genetics because of: (i) Small life cycle (two weeks). (ii) Can be fed on simple synthetic medium. (iii) Single mating produces large number of progeny. (iv) Clear differentiation of sexes. (v) Many heredity variations can be seen with low power microscopes. Choose the correct options:

Explanation

Q.33.
on Q235) “Independent pairs segregate independent of each other”: This statement is applicable to the segregation of:

Explanation

Q.34.
on Q236) If Mendel had studied 7 traits using a plant with 12 chromosomes instead of 14, he would have

Explanation

Q.35.
on Q237) Match the human genetic disorders with the causative abnormal chromosomes.
List I List II
A. Sickle cell anaemia Sex linked (X chromosome)
B. Colour blindness Autosomal chromosome 7
C. Phenylketonuria Autosomal chromosome 11
D. Cystic fibrosis Autosomal chromosome 4
E. Huntington's disease Autosomal chromosome 12

Explanation

Q.36.
on Q238) In a plant, gene X is responsible for flower colour, Y for plant height and Z for fruit shape. Recombination frequency of tall plant with white flower is 15% and tall plant with wrinkled fruit is 27% and white flower with wrinkled fruit is 12%. Then how is the arrangement of these genes on the chromosome?

Explanation

Q.37.
on Q239) If an organism having the chromosome number 2n = 36; the number of chromosome in triploidy, trisomy, monosomy, Tetrasomy, Nullisomy will be:

Explanation

Q.38.
on Q240) The chromosome arrangement in diploid cell is AABBCCDD. It has undergone numerical change in such a way that AABCCCCDD, it can be numerically represented as:

Explanation

Q.39.
on Q242) In a plant, gene "T" is responsible for tallness and its recessive allele "t" for dwarfness and "R" is reponsible for red colour flower and its recessive allele "r" of white flower colour. A tall and red flowered plant with genotype TtRr crossed with dwarf and red flowered ttRr. What is the percentage of dwarf - white flowered offspring of above cross ?

Explanation

Q.40.
on Q243) Segregation of genes take place during which phase of cell division ?

Explanation

Q.41.
on Q244) In humans , height shows a lot of variation . It is an example of

Explanation

Q.42.
on Q245) In a plant, red fruit (R) dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTT genotype is crossed with a plant that is rrtt. Then

Explanation

Q.43.
on Q246) State the mutant gene Which converts the male flowers into female flowers In Maize plant

Explanation

Q.44.
on Q247) "Large thick and Swollen tongue and droping lips"----- are the symptoms of which genetical disorder

Explanation

Q.45.
on Q248) What does the diagram represent ?
unit-7_ch-2_que_no-248_img_no1.png

Explanation

Q.46.
on Q249) Asserton (A) :- Alkaptonuria is not an inborn error in metabolism Reason (R) It is caused by crossing over.

Explanation

Q.47.
on Q250) A woman with normal vision, but whose father was colourblind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy

Explanation

Q.48.
on Q251) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?

Explanation

Q.49.
on Q252) Test cross involves .... ...

Explanation

Q.50.
on Q253) A human male produces sperms with the genotypes AB , Ab , aB , ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

Explanation