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melomori [17]
4 years ago
12

Dichotomous keys are constructed based on

Biology
1 answer:
maksim [4K]4 years ago
7 0

Answer:

B is the right answer

combinations of characteristics in known organisms.

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Parents that are heterozygous for having freckles (dominant) are crossed.
sergiy2304 [10]

Answer:

Phenotypic ratio - 3 Freckes : 1 No freckles

Explanation:

This question represents a monohybrid cross i.e. involving a single gene coding for possession or not of freckles. The allele for possession of freckles (F) is dominant over the allele for no freckles (f).

In a cross between two HETEROZYGOUS parents i.e. Ff × Ff, each parent will produce gametes with alleles F and f respectively. Using a punnet square (see attached image), four possible offsprings will be produced with genotypes: FF, Ff, Ff and ff.

Based on this genotypes, the phenotypic ratio of the offsprings will be 3:1 where 3 offsprings will possess freckles and 1 will have no freckles.

6 0
3 years ago
When a cell of a plant stem divides, each new cell has ______.
zzz [600]
B. the same number of chromosomes as the parent cell. - as a result of mitosis.
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How correct was Wagner’s concerning pangaea’s Land masses
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Http://www.indiana.edu/~geol105/images/gaia_chapter_3/wegener.htm
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3 years ago
. A protease is added to a suspension of egg protein in a test-tube and kept at 37°C. After 8 minutes, the protein changes from
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Answer:

amino acids

Explanation:

A protease is an enzyme capable of catalyzing the breakdown of proteins into polypeptide fragments and single amino acids, which are the building block of proteins. Proteases act by breaking peptide bonds by a process called hydrolysis, a reaction where water molecules break down peptide bonds (hydro means water and lysis means split). Proteases can be classified depending on the catalytic residue into cysteine, serine, threonine, aspartic, glutamic and metalloproteases.

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