In this figure, the genotype of the resistant parental bollworms is while the susceptible parental bollworms have a genotype.
In these data, the parental generation characteristics (resistant or susceptible) are shown at the top.
A. Rr; RR
B. Rr; rr
C. RR; rr
D. rr; RR
E. RR; Rr
D. rr; RR
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During the eugenics movement of the 1900s, it was believed that individuals affected with certain genetic disorders should be sterilized to prevent transmitting the gene to future generations. Would such measures be effective? Why or why not?
What will be an ideal response?
Recent analysis indicates that the chytrids are the most primitive division of fungi and that a single event resulted in the loss of flagella in the more advanced fungi.
Answer the following statement true (T) or false (F)
P bodies play an important role in
A) post-transcriptional regulation in eukaryotic cells. B) epigenetic regulation in eukaryotic cells. C) operon regulation in prokaryotic cells. D) chromosome inactivation. E) epigenetic and post-transcriptional regulation in eukaryotic cells.
Which of the following statements about skeletal muscle contraction is false?
(a) When a muscle cell receives a signal from the nervous system, voltage-gated channels open in the T-tubule membrane. (b) The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system cause an influx of Ca2+ into the sarcoplasmic reticulum, triggering a muscle contraction. (c) A change in the conformation of troponin leads to changes in tropomyosin such that it no longer blocks the binding of myosin heads to the actin filament. (d) During muscle contraction, the Z discs move closer together as the myosin heads walk toward the plus ends of the actin filaments.