A breeder of cattle has a herd of white cows and a
roan bull. Hair color in this breed is controlled by an
incompletely dominant gene. The two homozygous
forms are either red or white, and the heterozygous is
roan.
(a) What colors of calves are expected and in what
proportions?
(b) Outline a procedure to develop an all-red herd. What will be an ideal response?
Answer: (a) 1/2 white, 1/2 roan
(b) Roan with white —-> roan, roan x roan ----->
red, roan x red —-> red, red x red ----> red
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What events would lead to directional selection?
_____ a new allele arises that increases fitness _____ a population's main food source changes _____ a population's environment becomes increasingly heterogenous _____ heterozygotes have a fitness advantage over homozygotes
Most of our food crops come from angiosperms.
Answer the following statement true (T) or false (F)
The tundra, boreal forest, and tropical savanna are all
A. communities. B. ecosystems. C. food chains. D. biomes.
The carcinogen known to cause the most cases and types of cancer is
A) X-rays. B) ultraviolet light. C) alcohol. D) tobacco.