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victus00 [196]
3 years ago
10

Please help, I’ll give brainliest.

Biology
1 answer:
Margarita [4]3 years ago
4 0

Answer:

it involves a physical exchange of chromosome segments in the tetrad (3)

Explanation:

def of crossing over

Crossing over is the swapping of genetic material that occurs in the germline

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A female fly is heterozygous for three X-linked genes. The dominant alleles are ABC and the recessive alleles are abc. She is cr
telo118 [61]

Answer:

<h2>(14+16)/1000 *100= 3</h2>

Explanation:

Parental combinations are always more common then other recombinant progenies.

A female fly is heterozygous for three X-linked genes crossed with an abc/Y male. . If single crossover occurs between a & b  and between b & c, then the double cross is that, which occurs in both.

Double cross over progeny are always least in number, so here double cross occurs are in abC 14 and ABc 16.

So we are expecting that number of double cross over progeny= (14+16)/1000 *100= 3

8 0
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Some algae demonstrate the phenomenon of alternation of generations, in which a multicellular, diploid, spore-producing organism
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Answer:

Option c. Only the haploid organism may also reproduce asexually.

Explanation:

It is scientifically approved that algae and fungi are able to form true asexual spores. This process of spore formation involves mitosis and resultant spore is called mito-spore which develop into new offspring.

Reference: Smith, B. A., and DANIEL D. Burke. "Evidence for the presence of messenger ribonucleic acid in Allomyces macrogynus mitospores." Journal of bacteriology 138.2 (1979): 535-541.

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4 years ago
Draw an animal cell and label it's parts<br>​
son4ous [18]

Explanation:

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In aquatic ecosystems, phytoplankton and other photosynthetic organisms appear in the upper layer of the water, but not deeper l
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