Biology, 01.09.2019 01:30 miaa1024

In radishes, red and white are pure-breeding colors, while the hybrids are purple. if av red radish is crossed with a white raddish, what will be the phenotype of the f2 generation

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Pure breed essentially refers to the genotypes being homozygous (both alleles are the same, for example RR or rr.) If red represents RR and white rr, assuming one has complete dominance over the other, crossing RR x rr would give us:
Rr no matter how times your cross the parents! Why? Because the red radish can only give one type of allele R, and the white can only give r to its progeny, thus all the radishes in your f1 (first generation progeny) will always be Rr, which is a hybrid that looks purple.
The f2 essentially means you've crossed your f1 generation together, and we already said that they will ALL be Rr; so we know you're going to cross Rr x Rr.
Rr x Rr yields a ratio of :
1 RR: 2 Rr: 1 rr (25%, 50%, 25%).
Now convert these genotypes to phenotypes and you've got your answer.

Answer from: Quest

Pro insulin undergoes extensive posttranslational modification along the production pathway .

Answer from: Quest

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

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In radishes, red and white are pure-breeding colors, while the hybrids are purple. if av red radish...

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