Assume a double crossover occurs in this pair of chromosomes that results in chromatids of the genotypes A b C and a B c. If the first crossover (the one between A and B) involves chromatids 1 (A B C) & 4 (a b c), which chromatids could be involved in the second crossover?
Consider a pair of homologous chromosomes heterozygous for three genes (e.g. A B C / a b c) during prophase I of meiosis. Let the sister chromatids of one homolog be numbered 1 and 2; and the sister chromatids of the other homolog be numbered 3 and 4.
A) 1 & 2
B) 3 & 4
C) 1 & 3
D) 2 & 4
E) 1 & 4
F) 2 & 3
E) 1 & 4
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Which of the following is true in the angiosperm life cycle?
a. Gametophytes originate within and are dependent upon sporophytes. b. Sporophytes originate within and are dependent upon gametophytes. c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant. d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation. e. Gametophytes are photosynthetic and partially independent from the sporophytes.
In 1953 the structure of DNA was determined to be a ________
Fill in the blank with correct word.
Which of the following is an organic chemical water pollutant?
A. cyanide B. pesticides C. heavy metals D. chloride ions
When comparing recombination rates between a dog with a genome size of 2410 Mb and a mustard weed with a genome size of 100 Mb, which would you expect to have a larger recombination rate per kilobase? Explain your answer
What will be an ideal response?