Biology, 02.04.2020 02:36 twinkie7078

Where should the loss of flagellated sperm be marked on the phylogenetic tree?

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Answer from: 2002babygurl

Options have not been provided. They are as follows:

a.) At the base of seed plants

b.) Both at the base of angiosperms and at the base of the gnetophytes, pines, and redwoods clade

c.) At the base of the gnetophytes, pines, and redwoods clade

d.) At the base of angiosperms

b.) Both at the base of angiosperms and at the base of the gnetophytes, pines, and redwoods clade

Explanation:

The phylogenetic tree of plants was made according to several characteristics. When vascular tissue made entry in the tree, it got divided into seedless vascular plants and seeded vascular plants. Till this time flagellated sperm was observed in plants.

When the seeded vascular plants were further divided into angiosperms and gymnosperms, flagellated sperm was first lost at the base of angiosperms. None of the angiosperms have flagellated sperms. Gymnosperms further got divided into two clades. The clade containing ginko and cycads still retained the flagellated sperm. But the clade consisting of gnetophytes, pines and redwoods lost flagellated sperm. So the characteristic of flagellated sperm was lost again at the base of gnetophytes, pines, and redwoods clade .

Hence, loss of flagellated sperm should be marked on the phylogenetic tree both at the base of angiosperms and at the base of the gnetophytes, pines, and redwoods clade .

Answer from: Quest

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.

Answer from: Quest

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar flies (drosophila). one sample revealed an anomaly: a white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs) produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait.

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