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SCORPION-xisa [38]
3 years ago
8

How many sex chromosomes are there​

Biology
1 answer:
a_sh-v [17]3 years ago
6 0

Answer: 2

Explanation: There's X (female) and Y (male).

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What is the most significant difference between freshwater aquatic ecosystems and marine ecosystems?​
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main difference between freshwater and marine life is the habitat they come from in the wild. Freshwater fish live in streams, rivers and lakes that have salinity of less than 0.05 percent. Depending on the species, fish can survive in temperatures ranging from 5 and 24 degrees Celsius

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How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when
aalyn [17]

Answer:

27 genotypes and 8 phenotypes

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Supposing that the genotypes of both of the parents are AaBbDd (A, B and D are dominant over a, b and d).  After completing the Punnett square, you can predict the following offspring:

I add an image where you can see all the 27 genotypes and frequencies.

Finally, all the 8 phenotypes with the following frequencies:

27/64 A-B-D-

9/64   A-B-dd

9/64   A-bbD-

9/64   aaB-D-

3/64   A-bbdd

3/64   aaB-dd

3/64   aabbD-

<u>1/64    aabbdd </u>

Total 64/64

Note: when a phenotype is A-, it means that it came from either genotype, AA or Aa. The same applies to B- (BB or Bb) and D- (DD or Dd)

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