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12 Cards in this Set

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During which stage of meiosis does recombination of parts of chromosomes occur?
first meiotic prophase
Assume that a diploid cell in G1 contains 20 picograms of DNA. How much DNA
would be in this cell in the first prophase of meiosis?
40 picograms
3. Which of the following statements about sister chromatids are true?
a. They are replicated chromosomes still joined together at the centromere.
b. They are identical in mitotic chromosomes.
c. They undergo recombination in mitosis.
d. They are identical in prophase II of meiosis.
e. Both a and b.
e. Both a and b.
When G1/S cyclin binds to CDK it triggers
the cell to pass the restriction point
MPF in yeast is composed of the M phase cyclin and a kinase. During the cell cycle:
The amount of this cyclin is maximal at M-phase, then declines. The amount of
kinase does not change.
CDKs catalyze the phosphorylation of targeted proteins, a process that…
changes the function or activity of the targeted protein
Phosphorylation of RB by the G1/S cyclin-CDK complex leads to…
activation of E2F, release of E2F by RB, transcription of genes required for S phase
For the gene that controls feather pigmentation in birds, having a pair of recessive
alleles generates a white bird (almost no color in the feathers). If two birds with normal
color are both heterozygous for this allele, what proportion of their offspring are
predicted to be white?
1/4
A pea plant that has yellow seeds and is tall is crossed with a plant that has yellow
seeds and is dwarf. The F1 progeny all have yellow seeds and are tall. When the F1 are
crossed all of the F2 progeny are either yellow and tall, or yellow and dwarf. What was
the genotype of the parents?
Alleles for seed color: Y=yellow, y=green. Alleles for plant height T=tall, t=dwarf
YYTT and YYtt
If an organism is heterozygous for a particular trait
it has two different alleles for the gene that specifies the trait
A plant with orange-spotted flowers was grown in the greenhouse from a seed
collected in the wild. The plant was self-pollinated and gave rise to the following
progeny: 88 orange with spots, 34 yellow with spots, 32 orange with no spots, and 8
yellow with no spots. What can you conclude about the dominance relationships of the
alleles responsible for the spotted and unspotted phenotypes? Of orange and yellow?
Orange dominant to yellow; spotted dominant to unspotted
The gene for red color in petunias exhibits “incomplete dominance.” If the genotype
is RR, the phenotype is red. If the genotype is rr the phenotype is white. If the genotype is
Rr, the phenotype is pink. If two pink flowering plants are crossed, what ratio of
phenotypes do you predict in the progeny?
1 red: 2 pink:1 white