In a pedigree chart, a female who does not demonstrate the trait being studied is represented by a
a. darkened square.
b. clear diamond.
c. clear circle.
d. darkened triangle.
e. darkened oval.
C
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Which one of the following types of proteins interacts directly with a stop codon?
A. release factor B. initiation factor C. transcription factor D. elongation factor E. sigma factor
When applying the Hardy-Weinberg law to a gene with dominant and recessive alleles, calculation of the allele frequencies always begins by writing the frequency of the _____________________ phenotype, then taking the _____________________ of this to obtain the frequency of the recessive allele
Fill in the blank(s) with correct word
You are examining the effect of maturation-promoting factor (MPF) in sea urchin cells, which have a diploid number of 36. If you fuse a dividing sea urchin cell with a G1 arrested oocyte, what would be the outcome?
A. The G1 cell would first go through S phase and then mitosis. Its daughter cells would have 36 chromosomes. B. The G1 cell would undergo mitosis and its daughter cells would each have 18 chromosomes. C. The G1 cell would undergo mitosis and its daughter cells would each have 36 chromosomes. D. The G1 cell would enter mitosis, but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated.
Which of these plant tissue types is composed of sieve-tube members and companion cells, and transports organic nutrients made in the leaves?
A. collenchyma B. sclerenchyma C. xylem D. phloem E. parenchyma