____ in angiosperms occurs when a sperm cell "fertilizes" a diploid (2n) cell within the future seed (eventually forming a triploid (3n) endosperm), and a second sperm fertilizes a haploid (1n) egg
Fill in the blank with the appropriate word.
Double fertilization
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After conjugation between an F+ cell and an F- cell, is the F- cell F- or F+? After conjugation between
an Hfr cell and an F- cell, is the F- cell F- or F+? Explain each answer.
What will be an ideal response?Which statement is true?
A) A line of lobe-finned fishes gave rise to tetrapods, and a line of tetrapods gave rise to modern amphibians. B) A line of tetrapods gave rise to chordates, and a line of lobe-finned fishes gave rise to tetrapods. C) A line of amphibians gave rise to tetrapods, and a line of lobe-finned fishes gave rise to modern amphibians. D) Tetrapods and amphibians evolved at approximately the same time, while lobe-finned fishes evolved 2 million years later.
Ozone in the atmosphere shields us from ________
Fill in the blank(s) with correct word
The phenomenon in which one region of the body grows faster than another among different species is called
A. heterochrony. B. paedomorphosis. C. Gremlin and BMP4 interaction. D. phenotypic variation. E. Hox gene clustering.