ws+; ws+; ws+; ws+; ws; ws; ws; ws
In Neurospora, the white-spore allele (ws) results in white spores rather than the wild-type black spores. Diploid ws / ws+ cells undergo meiosis followed by one round of mitosis to form ordered tetrads. Indicate if the pattern of spores seen in the tetrads are consistent with first-division or second-division segregation.
A) first-division segregation pattern
B) second-division segregation pattern
A) first-division segregation pattern
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Your botany teacher is making assignments for a research project on a plant species. She assigns you to study hemlock (Conium maculatum) and mentions that is an r-selected species. Based on this, what characteristics would you predict to be true of hemlock? Check all that apply.
_____ HABITAT: Disturbed areas like the edges of agricultural fields. _____ HABITAT: Pristine, undisturbed meadows. _____ REPRODUCTION: Large numbers of seeds produced at a time. _____ REPRODUCTION: Small numbers of large seeds produced. _____ LIFESPAN: One to two years. _____ LIFESPAN: Several decades.
If you want to know the probability that tossing two coins will result in a particular outcome (two heads, for example), you use the
A. punnett rule. B. product rule. C. sum rule. D. genetics rule. E. Bergman's rule.
Guttation results from __________
a. water pressure b. transpiration pull c. osmotic pressure d. root pressure e. sink-to-source transport.
What is the unique thing about stem cells that makes them so desirable for therapeutic use?
a) they can divide forever and never go through apoptosis b) they develop into nerve cells and can be used by stroke victims c) they can develop into many different tissue types d) they develop into organs needed form transplant e) they are found in reproductive tissue