Generally, it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis. However, it is possible to assert that XYY results from nondisjunction during
A) oogenesis.
B) spermatogenesis.
C) mitosis.
D) cytokinesis.
Ans: B) spermatogenesis.
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The root-shoot axis of plants
A. is determined by the orientation of the first zygotic cell division. B. is determined by sunlight, as roots grow away from the sun and shoot grow towards the sun. C. is determined by three axes. D. develops in segments. E. None of these are correct.
Which of the following is NOT characteristic
of parasites?
a. They are specialists and usually are able to affect only one variety of hosts. b. They inflict serious injury and kill their hosts. c. Some reside inside their hosts, whereas others live outside their hosts. d. Their host may be a plant as well as an animal. e. They are dependent on hosts.
Sex-influenced traits are expressed ____
a. aftafter the formation of a Barr body b. more in males than in females c. as a result of hormone differences between males and females d. only in males e. only in females
The primary transcript is _________ to the DNA template strand.
A) identical B) antiparallel C) complementary