26) Morgan’s experiment shows the presence of an X-linked gene therefore providi

Question

26) Morgan’s experiment shows the presence of an X-linked gene therefore providing evidence that genes are on chromosomes. A male that carriers the white mutation is said to be ___________. a) Homozygous dominant. b) Homozygous recessive. c) Heterozygous. d) Hemizygous.

27) In a human somatic cell, there are ___ autosomes and ___ sex chromosome(s). a) 22…1 b) 23…1 c) 44…2 d) 46…2

28) Trisomy 21 causes Down syndrome, which affects one of 600 children at birth. Which of the following is FALSE regarding this condition. a) It has three copies of chromosome 21. b) It is caused by non-disjunction in meiosis. c) Affected individuals have developmental problems and mental retardation. d) It is caused by a gene mutation that is passed on between generations. e) There are a total of 47 chromosomes in the somatic cell of a Down syndrome individual.

Explanation / Answer

Answers:

Q25). c

Q26). d

Q27). c

Q28). d

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