15. Aneuploidy is nearly always deleterious because • it is responsible for the
ID: 71104 • Letter: 1
Question
15. Aneuploidy is nearly always deleterious because
• it is responsible for the lack of fertility in tetraploids
• the balance of the genome is upset by either missing or additional chromosomes
• chromosomes from different species are present in one individual
16. Triploids do not normally occur in animals, but are fairly common among plants. However, triploid plants are sterile. Why is this so?
• the odd number of chromosomes produces a chromosome imbalance in the gametes
• the third chromosome prevents synapsis of the other two
• gametes with three chromatids are inviable
• synapsis among three chromsosomes leads to nondisjunction and nullo gametes
17. Which of the following was inferred by Mendel from the outcome of a cross involving individuals that differed in one trait?
• genes exist as pairs
• offspring receive one set of genes from each parent
• in a heterozygote, half the gametes will receive one form of the gene, half the other
• all of the above
18. Which of the following is not attributable to Mendel?
• genes are located on chromosomes
• genes are inherited in a particulate manner
• genes are found in pairs
• some genes may be dominant over others
19. Two normal parents produce a daughter that expresses a rare disease and a son that is normal. From this it is apparent that the disease is
• autosomal dominant
• autosomal recessive
• sex linked dominant
• sex linked recessive
20. Which pair of individuals permits a determination as to whether the disease in the above question was autosomal or sex linked?
• daughter-mother
• son-father
• son-mother
• daughter-father
21. Heterochromatin, considered to be largely inactive, consists of
• tightly coiled DNA
• loosely coiled DNA
• DNA lacking histone proteins
• DNA with darkly staining linkers between nucleosomes
22. Which of the following has the least number of chromosomes?
• a sex cell before meiosis
• a sex cell after meiosis
• a body cell before mitosis
• a body cell after mitosis
Explanation / Answer
Answers:
15. • the balance of the genome is upset by either missing or additional chromosomes
16. • the third chromosome prevents synapsis of the other two
17. • all of the above
18. Which of the following is not attributable to Mendel?
• genes are inherited in a particulate manner
19. • sex linked dominant
20. • daughter-mother
21. • tightly coiled DNA
22.• a sex cell after meiosis
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