Four of these statements are true about mitochondria. Which one is not true?
a. They have DNA.
b. Their DNA can experience mutations.
c. In animals, the mitochondria come from the mother.
d. They undergo genetic recombination during fertilization.
e. Their DNA can be used as molecular clock.
ANSWER: d
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Homologous genes in different species are called
A. analogs. B. paralogs. C. orthologs. D. dialogs. E. monologs.
Viral gastroenteritis that affects people of all ages and usually lasts less than 3 days is caused by
A. herpes. B. hepatitis B. C. norovirus. D. rotavirus.
When blood pressure falls below normal, the condition referred to as ________ results
Fill in the blank(s) with correct word
Thanks to a novel recessive mutation, a certain plant species has begun to invade colder Arctic regions outside of its normal range. However, this cold-tolerant mutation has not yet become fixed in the population. A second mutation arises that promotes self-pollination. Do you predict that the self-pollination allele will be selected for in the Arctic regions? Why or why not?
A. No. Plants that produce flowers must be cross-pollinated for proper seed development. B. Yes. The self-pollinated plant is more likely to maintain the cold-tolerant mutation, and plants in the Arctic are unlikely to be visited by pollinators. C. No. Outcrossing is always beneficial, since it enhances genetic diversity. D. Cannot make a prediction from the information given. It depends on whether the plant is normally insect pollinated or wind pollinated.