Which of the following is not true of heterochromatin?
a. It is highly condensed chromatin.
b. There are two forms of it, called constitutive and facultative heterochromatin.
c. It is transcriptionally active.
d. It is largely localized to the nuclear periphery.
Ans: c. It is transcriptionally active.
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The locus is the physical place of a gene on a chromosome
Indicate whether the statement is true or false
What would you predict would happen in an area of the body where blood was relatively acidic (low
pH)?
a. O2 would bind more readily to hemoglobin. b. CO2 would bind more readily to hemoglobin. c. O2 would release from hemoglobin. d. CO2 would release from hemoglobin. e. binding of O2 by hemoglobin would cease.
Which of the following sequences could be cut by a restriction enzyme?
A. ACAAGA B. AATTACC C. CATTAC D. ACTACT
In Drosophila, an individual female fly was observed to be of the XXY chromosome complement (normal autosomal complement) and to have white eyes as contrasted with the normal red eye color of wild type
The female's father had red eyes, and the mother had white eyes. Knowing that white eyes are X-linked and recessive, present an explanation for the genetic and chromosomal constitution of the XXY, white-eyed individual. It is important that you state in which parent and at what stage the chromosomal event occurred that caused the genetic and cytogenetic abnormality.