You sample a population of butterflies and find that 42% are heterozygous at a particular locus (location of gene). What should be the frequency of the recessive allele in this population?
a. 0.09
b. 0.30
c. 0.49
d. 0.70
e. allele frequency cannot be determined from this information
Ans: e. allele frequency cannot be determined from this information
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Match the following items to the correct phrase.
_______1. Facultative anaerobes. _______2. Microaerophiles. _______3. Some species are aerotolerant anaerobes and some species are obligate anaerobes. _______4. Fastidious bacterial pathogens that will grow on chocolate agar but not on blood agar. _______5. Capnophiles. _______6. Acid-fast bacteria. a. Neisseria gonorrhoeae and Campylobacter spp. b. Clostridium spp. c. E. coli, most Staphylococcus and Streptococcus spp. d. Mycobacterium and Nocardia spp. e. Neisseria gonorrhoeae and Haemophilus influenzae
Nondisjunction can occur at either the first or second division of meiosis. XXY individuals could arise from nondisjunction at the ________ meiotic division in the ________.
A) first; mother B) second; mother C) first; father D) second; father E) More than one of the choices could give rise to XXY individuals.
If gene replacement therapy became available
a. it would not work for humans because we have too many chromosomes. b. it would involve a surgical technique that separates chromosomes that have failed to segregate properly during meiosis II. c. it could be used to treat victims of a recessive disease by removing the dominant damaging autosomal allele and replacing it with a harmless one. d. it would replace defective alleles with normal ones. e. it would remove entire chromosomes from cells and repair the defective genes.
Female gametes complete meiosis II at ____________________. Fill in the blank(s) with the appropriate word(s)