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nalin [4]
3 years ago
11

Which species is/are most closely related to species S?

Biology
1 answer:
hodyreva [135]3 years ago
6 0

Answer:

The pattern of branching in a phylogenetic tree reflects how species or other groups evolved from a series of common ancestors. In trees, two species are more related if they have a more recent common ancestor and less related if they have a less recent common ancestor.

\bf \huge \red{F} \bf \pink{O}\bf \purple{L}\bf \blue{L}\bf \green{O}\bf \red{W} \: \bf \pink{x} \bf \purple{I} \bf \blue{t} \bf \green{z} \bf \red{M} \bf \pink{u} \bf \purple{s} \bf \blue{k} \bf \green{x}

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Pure-breeding sweet peas with purple flowers and round pollen are crossed with pure-breeding sweet peas with red flowers and lon
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C. 40

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Pure-breeding means that the individuals are homozygous for the genes being analyzed.

From Mendel's Law of Dominance we know that the traits that appear in the F1 are the dominant ones.

I will call:

P_ = purple flowers

pp   = red flowers

L_ = long pollen

ll  = round pollen

Initial cross:

P      Pl/Pl    x    pL/pL

F1              Pl/pL

<u>Test cross</u> (cross with a homozygous recessive individual):

Pl/pL   x  pl/pl

<u>Expected progeny:</u>

Pl/pl = Parental (purple flowers, round pollen)

pL/pl = Parental (red flowers, long pollen)

PL/pl = Recombinant (purple flowers, long pollen)

pl/pl = Recombinant (red flowers, round pollen)

20% of the offspring have purple flowers and long pollen (PL/pl).

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