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.
Nondisjunction could have occurred either at meiosis I or meiosis II in the mother, thus giving the XwXwY complement in the offspring.
You might also like to view...
Which gland is the remnant of the "third eye"?
a. pineal b. pituitary c. thyroid d. parathyroid e. thymus
Most automated nucleotide sequencing machines detect bands by ________.
A. autoradiography B. measuring incorporated radioactivity C. laser induced fluorescence D. sizing DNA fragments produced by base specific chemical cleavage reactions
The mode of transmission of B. pertussis can best be described as:
a. person-to-person contact. b. exposure to contaminated water. c. inhalation of contaminated air. d. close contact with animals.
The usual type of symbiotic relationship between humans and the bacteria normally found in their intestinal tract is that of
A. predator/prey. B. parasitism. C. mutualism. D. communism.