Four of the five events listed below are related by a
common phase of mitosis. Select the exception.
a. chromosomes align at the spindle equator
b. sister chromatids become individual chromosomes
c. microtubules shrink at both poles
d. motor proteins drag chromosomes to the poles
e. spindle poles are pushed farther apart
Answer: a
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Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene - an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less). The allele for long eyelashes is dominant (L) and the allele for short eyelashes is recessive (l). An individual who is heterozygous for eyelash length would have which
of the following phenotypes? A. ll B. LL C. Ll D. Long eyelashes E. Short eyelashes
All EXCEPT which of the following
statements about Neanderthals is true? a. Neanderthals diverged from modern humans around 500,000 years ago. b. They lived in Europe and the Near East. c. Neanderthals are direct ancestors of Homo sapiens. d. Neanderthals brains were larger than those of modern humans. e. They have no modern descendents.
Answer questions 120–124 in reference to the five items listed
below. a. 12 b. 23 c. 24 d. 46 e. 47 D 120. How many chromosomes does each somatic cell have in a human male who has two X chromosomes? D 121. Following a gene duplication event involving only five loci, how many chromosomes will a human female have? D 122. How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)? D 123. How many chromosomes are present in each cell of the germ cell line for a tetraploid species where its normal complement of chromosomes is 48? D 124. The normal sperm cell of species X carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, others will have 22, and the remainder will have how many chromosomes?
Riboswitches regulate transcription, rather than translation, in cells.
Answer the following statement true (T) or false (F)