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Select the option with correct set of statements for Punnett square. (1) Developed by British geneticist. (2)Used to calculate the probability of genotypes offsprings. (3)Useful for monohybrid crosses only. (4) It is a mathematical formula which helps to calculate the types of gametes.

A

Only (1),(2) and (3)

B

Only (1) and (4)

C

Only (2) and (4)

D

Only (1) and (2)

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Select the option with correct set of statements for Punnett square. (a) Developed by a British geneticist. (b) Used to calculate the probability of genotypes of offsprings. (c) Useful for monohybrid crosses only. (d) It is a mathematical formula which helps to calculate the types of gametes.

Assertion :- Punnett sequare is a graphical representation to calculate the probability of all possible genotypes of offsprings in a genetic cross. Reason :- It was developed by a British geneticist, Raginald C. Punnett.

Given below are four statement (i) - (iv) each with two blanks. Select the option which correctly fills up the blanks in any two of these statements (i) The columnar epithelium is composed of ul(1) and slender cells. Their ul(2) are located at the base (ii) Collagen fibres provide ul(3) and elastin fibres provide ul(4) and elasticity to the tissue (iii) Adipose tissue is a ul(5) type of connective tissue located mainly beneath ul(6) (iv) Tendons attach ul(7) to bones and ligaments attach ul(8) to bones.

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Read the following statements about WBCs and select the correct option 1) Lymphocytes are responsible for immune responses of the body 2) Basophils are least in number among white blood cells. 3) Eosinophils can engulf antigen-antibody complexes 4) Monocytes are the only phagocytic ceils of blood so that they are waited internal scavengers.

Given below are four statements (A–D ) each with one or two blanks. Select the option which correctly fills up the blanks. Statements : (A) Miller and Urey while creating probable conditions on the primitive earth in the laboratory used mixture of methane, water vapour , hydrogen , and ........(i)...... (B) Information of extinct organisms can be obtained by the help of ....(i) .... evidence which can be very easily isolated from ....(ii) .... types of rocks . (C) Darwin selection can be concluded with the introduction of ...(i)... in organisms . (D) Natural selection can be concluded with the introduction of ........(i).......in organisms.

J.C. Slater proposed an empirical constant that represents the cumulative extent to which the other electrons of an atom shield (or screen) any particular electron from the nuclear charge. Thus, slater's screening contant sigma is as : Z^(**)=Z-sigma Here, Z is the atomic number of the atom, and hence is equal to the actual number of protons in the atom. the parameter Z^(**) is the effective nuclear charge, which according to is smaller than Z, since the electron in question is screened (shielded) from Z by an amount sigma . Conversely, an electron that is well shielded from the nuclear charge Z experiences a small effective nuclear charge Z^(**) . The value of sigma for any one electron in a given electron configuration (i.e., in the presence of the other electrons of the atom in question) is calculated using a set of empirical rules developed by slater. according to these rules, the value of sigma for the electron in question is the cumulative total provided by the various other electrons of the atom. Q. Which of the following statement is correct?

Refer the given statements and select the correct option (i) Percentage of homozygous dominant individuals obtained by selfing Aa individuals is 25 % (ii) Types of genetically different gametes produce by genotype AABbcc are 2 (iii) Phenotypic ratio of monohybrid F_(2) progeny in case of Mirabilis jalapa is 3 :1

Read the given statements and select the correct option Statement 1 : Test cross is used to determine an unknown genotype within one breeding generation Statement 2 : Test cross is a cross between F_(1) hybrid and dominant parent.

On the basis of given statement, select the option which only correct statements. i) outcrossing often helps to overcome inbreeding depression ii) MOET involves enhancing ovulation by injecting oxytocin iii) many new animal breeds have been developed by cross-breading iv) hisadale is a new breed of goat developed in Punjab by crossing Bikaneri rams and Marino ewes

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