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Recent questions in Biology
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Which stage of prophase I of meiosis is characterized by fully compacted chromosomes ready to begin metaphase?
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Biology
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anonymous
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A base change that changes a codon for an amino acid to a stop codon
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Biology
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It was once thought that the ____ karyotype was related to criminal disposition because it led to aggressive behavior due to excessive "maleness".
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Biology
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anonymous
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Genes ho and dp are 9.0 map units apart, and genes dp and da are 26.3 map units apart. What is the probability of a double crossover in these regions?
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A ___ is an enzyme that recognizes a short nucleotide sequence in a DNA molecule and cleaves the molecule at that site.
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Consider a fully heterozygous flowering plant with normal blue flowers and round seeds. This plant, when crossed with one that has red flowers and oval seeds, results in the following progeny:
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Biology
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The group of plants with vascular tissues and motile sperm?
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Biology
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Variable number tandem repeat (VNTR)
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A new Penicillium mutant was tested for auxotrophy. The mutant grows on:
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Biology
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Chromosomes that contain the same sets of genes and pair up in meiosis I are called ___?
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What genotype is present most often among the progeny (F2) of a dihybrid cross (AaBb X AaBb)?
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The Drosophila genes for white eyes (w), tan body (t) and vestigial wings (vg) lie at map positions 2, 22, and 52 respectively. Out of 500 progeny, 21 exhibited double crossovers. What is the degree of interference?
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12 years
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A plant without vascular tissue?
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A species of mice can have gray or black fur and long or short tails. A cross between black-furred, long-tailed mice and gray-furred, short-tailed mice produce all black-furred, long-tailed offspring. Using the gene symbols G for black, g for gray, S for long and s for short, what would be the genotype of a gray-furred, short-tailed mouse?
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12 years
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anonymous
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In the F1 dihybrid cross (WwGg X WwGg), in which W = round, w = wrinkled, G = yellow and g = green, what is the probability of obtaining an individual that is round, green and true-breeding?
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12 years
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Biology
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anonymous
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Synapsis is one of the most significant events in meiosis. What is the outcome of synapsis?
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12 years
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Biology
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anonymous
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3. What would be the dimensions of a Punnett square for the cross Ww x ww?
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12 years
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Biology
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The basic diploid chromosome number in Poinsettia is 16. A new species of Poinsettia is found that has four complete sets of the chromosomes found in the 16 chromosome species. This species is said to be
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12 years
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anonymous
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A researcher studying hemoglobin predicts that a histidine within the protein is important for binding oxygen. She used site-directed mutagenesis to change a codon for histidine (CAU) to one for lysine (AAA). However, the mutant hemoglobin still binds oxygen just as well as the wild-type and has no other apparent changes. This type of mutation is called
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12 years
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anonymous
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The diploid stage of a plant's lifecycle?
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