Mendel imagined that seed color in pea plants is influenced by a gene with two alleles in which the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). What would Mendel predict the seed colors would be from a cross of a male plant with the mixed Yy genotype with a female plant with the yy genotype?
a. All seeds should be green.
b. All seeds should be yellow.
c. There should be 3 green seeds for every 1 yellow seed.
d. There should be 1 green seed for every 3 yellow seeds.
e. There should be 1 green seed for every 1 yellow seed.
Ans: e. There should be 1 green seed for every 1 yellow seed.
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A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Both pre-¬ and post-¬zygotic isolating mechanisms have arisen. B. Reproductive isolation is incomplete. C. Pre-¬zygotic isolating mechanisms have arisen. D. Post-¬zygotic isolating mechanisms have arisen. E. Gene flow between the two populations does not occur.
In which region of the plant are you most likely to find cells dividing by mitosis?
A. The growth rings B. The sapwood C. The meristem region D. The heartwood
In a pedigree chart, a male who demonstrates the trait being studied is represented by a ____
a. darkened square b. darkened diamond c. clear circle d. clear square e. darkened circle
During the late 1800s, cattle egrets arrived in South America from Africa and began to colonize. Their range has expanded dramatically over the years. Why were they able to do this?
A. There were abundant cattle for the birds to gather around in South America; furthermore, various animals that the egrets had lived around in Africa had become quite scarce because of overhunting and poaching, causing the birds to extend their range. B. The habitats that they left in Africa were not suitable for any further colonization; thus, they were forced to emigrate. C. The food resources in South America were far superior to those in Africa, allowing the egrets more opportunity to grow and reproduce and ultimately expand their range. D. The habitats that they encountered in South America were suitable to them and unoccupied.