How many unrooted trees are possible for a six-species tree and a seven-species tree, respectively?
a. 6 and 7 c. 105 and 945
b. 15 and 25 d. more than the stars in the universe
B
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Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because _____
A) sterilized soil kills the root hairs as they emerge from the seedling B) the normal symbiotic fungi are not present in the sterilized soil C) sterilization removes essential nutrients from the soil D) water and mineral uptake is slower when mycorrhizae are present
The fusion of gametes, resulting in the formation of a zygote, is called ____
Fill in the blank with the appropriate word.
Anthrax is a highly infectious disease of animals that can be transmitted to humans who come in direct contact with infected animals or their products.
Answer the following statement true (T) or false (F)
In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett
square shown, what were the phenotypes of the parental plants that were used in this cross by Mendel? A) Rryy and RrYy B) Rryy and rrYy C) RRyy and rryy D) RrYy and RrYy