C.Testcross 16 Who is the father of genctics? A Thomas Hunt Morgan B Watson and

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C.Testcross 16 Who is the father of genctics? A Thomas Hunt Morgan B Watson and Crick C. Gregor Mendel D. Benjamin Lewin D. Polytene chromosomes 27. Which of the following have undergone several rounds of DNA replication without cell division? A. Mitotic cells B. Tetrad chromosome C. Polytene chromosome D. Crossing over 17. What is the law of segregation? A. Unlinked alleles will separate independently of B. C. each other during Alleles will separate into different gametes All chromosomes are polytene None of the above D. How to distinguish between the sexes of the male and female flies based on size? A Females are larger than males B. Only males have sex combs C. Only male have egg, larvac, pupa and adult D. Only females have red eyes I8. 28. How can polytene chromosomes be identified? A. By compound microscope B. By their length and banding pattern C. By using fluorescent dye D. None of the above 19. Capital leter, lowercase letters A. Symbol of male and female flies Symbol of dominant allele and recessive allele B. Symbol of red eye and white eye None of the above C. D. 29. When can polytene chromosomes be seen? A. In interphase cell when cells are metabolically active B. In prophase cells C. In metaphase cells D. In anaphase cells What genotypic ratio would you get from crossing two parents heterozygous for both genes? A 1:2:2:1 20. C. 9:3:3:1 Label the steps according to the serial of procedure performed in laboratory while doing drosophila breeding experiment (21 25) A. Label vial with date and types of male and 21. 30. Why do polytene chromosomes appear so long? A. They are paired with their homolog in somatic cell B. They stay in dead cell C. They are single pair D. They are mutated female flies used B. After the flies wake up they can be added to the food vials C. Anesthetize flies 7 D. Subculture the mutant and wild stocks every one to two weeks; never keep the vials with cultures longer than 3 weeks 31. What stain/dye used in the lab exercise? A. Acetooricin B. Ethidium bromide C. Propidium iodide D. FlyNap E. Transfer flies to an empty vial with brush (N. B. Dark the answer sheet from numbers 21 25, from the answer choices A-E) 26. To determine the genotype of an individual, Mendel developed a procedure called a_ A. Homozygous allele B. Hetcrozygous allele 32. Polytene chromosomes are A. Small, single stranded

Explanation / Answer

Ans-16

Options (C) is correct

Ans-17

According to law of segregation alleles segregate or separate independently during gamet formation and unite during fertilization.

So option (B) is correct

Ans-18

Female fly having longer abdomen However mail fly having short abdomen.

So (a)option is correct

Ans-19

As we know that in genetics , Mendel represented dominant allele from capital letter and recessive allele from smaller letter.

So option (B) is correct

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