Imagine that you self-pollinate heterozygous purple-flowered, long-pollened pea plants and get mostly purple-flowered, long-pollened plants and white-flowered, short-pollened plants, with a few purple-flowered, short-pollened or white-flowered, long-
pollened plants. What is the most likely explanation?
A) Long pollen is often lethal, so few plants with long pollen survive to adulthood.
B) The genes for flower color and pollen length are linked.
C) The purple allele influences pollen to become shorter.
D) The gene for flower color is on a sex chromosome.
E) This is a normal random variation from the expected ratio for independent assortment.
B
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At the most fundamental of levels, differences among life histories are due to differences in the allocation of ________
Fill in the blank(s) with correct word
Which of the following phylogeny inference tools is the best at reconstructing the most accurate phylogenetic trees?
A) parsimony B) maximum likelihood C) Bayesian inference D) All of these methods have pros and cons.
Why do plants containing nitrogen-fixing bacteria in their roots need less nitrogen-based fertilizer than others?
A) The plants break down the bacteria as a source of nitrogen-rich nutrients. B) The bacteria convert nitrogen in the air into a form that can be taken up by the plants. C) The plants and bacteria work together to attract birds, which deposit nitrogen-rich droppings near the plant. D) The bacteria kill and digest earthworms and other animals in the soil, providing excess nitrogen to the plants.
In humans, gametes contain
A) 45 autosomes and 1 sex chromosome. B) 1 autosome and 45 sex chromosomes. C) 22 autosomes and 1 sex chromosome. D) 1 autosome and 22 sex chromosomes. E) 22 autosomes and 2 sex chromosomes.