Which of the following is true regarding karyotype? a) it is an ordered display

Question

Which of the following is true regarding karyotype? a) it is an ordered display of the chromosomes arranged by size and shape b) it shows all chromosomes found in a metaphase cell c) it is usually prepared from a cell in the interphase d) only a and b are true white e) only a and c are true A spontaneously aborted human embryo was found with 3n=69 chromosomes. This embryo represents a___. a) monosomy b) trisomy c) monoploidy d) triploidy e) none of the above A human with a karyotype 45, X0 is phenotypically__. a) a male b) a female c) a hermaphrodite d) an intersex e) embryo is aborted before sex develops The following illustrates a way in which a(n)___arises. a) truncation b) deletion c) termination d) duplication e) inversion A human with 47, XX + 21 chromosomes is an example of: a) monosomy b) monoploidy c) trisomy d) triploidy e) euploidy. A cross between the black and tan strains of Sordaria produced 100 asci. Among those, 52 asci contained recombinant spore arrangement. The distance of the tan locus to the centromere is therefore___. a) 52 m.u. b) 48 m.u. c) 26 m.u. d) 13 m.u. e) 6.5 m.u Corresponding figure illustrates results of a cross between the black and tan strains of Sordaria. Which of the asci (1-4) have the non- smooth recombinant spore arrangement? a) 1, b) 1, 2, 3 c) 2, 3, 4 d) 1, 2, 4 e) 2, 4 A cross between the between the black and tan strains of Sordaria was set up. The original arrangement of alleles (t_1 t_2 t_3 b_4) changed during crossing over between chromatids t_2 and b_3. The ascus resulting from this crossing over will contain the following spore pattern____. a) bbbbtttt b) bbttttbb c) ttbbttbb d) ttbbbbtt e) tbbt The segregation of alleles affecting ascospore color in Sordaria can be observed directly in the ascus by looking at the ascospore phenotypes, without any further genetic etacentric testing. This is due to the fact that Sordaria___ a) zygote is haploid b) is a fungus c) ascospores are diploid d) ascospores are haploid e) tan locus is X-linked

Explanation / Answer

27. Answer : d

Karyotyping is used to determine size, shape, and number of chromosomes in the cell sample. Metaphase chromosome is highly condensed so it is used for karyotyping.

28. Answer : d. triploidy

Trisomy means that there are 3 chromosomes but triploidy means that there are three sets of chromosomes (3n = 69). In the same way, monosomy means only one chromosome but monoploidy means one set of chromosomes (1n = 23)

29. Answer : b. a female. Turner syndrome is also known as 45,X or 45,X0 which is a condition in which a female is partly or completely missing an X chromosome.

30. Answer : b. Deletion. Because A is deleted from the chromosome

31. Answer :c.trisomy. Three copies 21 (X) chromosome.

32. Answer : a. 52 m.u

1 % recombination = 1 m.u

52 % recombination = 52 m.u

33. Answer : a.1.

1 alone has non-recombinant spore arrangement with no intermediate black or white.

34. Answer : c. ttbbttbb

Original arrangement is t1t1t2t2b3b3b4b4 but due to cross over between t2 and b3, it resulted in change of position.

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