You are studying reproduction in a species of frog. Two gametes that are diploid join to form a viable zygote (F1). If the F1 mates with one of the parents, will there be viable offspring?
A. yes
B. no
B
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Gene expression in developing organisms is regulated on several different levels. In many developing animals, regulation of gene expression is influenced by the action of Hox genes. Which of the following regulatory elements is produced by many Hox genes?
A) transcriptional factors B) cell-surface molecules for cell-cell interactions C) signals from maternal cytoplasm, such as bicoid D) mRNA processing factors
. By the __________ theory, transpiration pulls water upward by creating a continuous negative pressure (or tension)
inside xylem. Fill in the blank(s) with the appropriate word(s).
Researchers studying an endangered lizard species find a successful population of the lizard in a certain area. The researchers determine that this population has reproduced primarily through parthenogenesis. What are the researchers likely to recommend to conservation officials who are trying to protect the species?
a) move the successful population to a different area where lizard populations are struggling b) remove all lizards from the wild and place them in a captive breeding program c) remove as many predators as possible from the area with the successful population d) try to prevent changes to the environment in the area with the successful population
Sickle-cell trait occurs in individuals heterozygous for the autosomal-recessive gene. What is the likelihood that a person who has two parents with sickle-cell trait will have the disorder?
A) 100% (certain) B) 0% (impossible) C) 50% D) 25% E) not enough information given to answer the question