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beks73 [17]
3 years ago
9

What is a classification key? dichotomous key?

Biology
1 answer:
REY [17]3 years ago
7 0
A classification key is a way of categorizing living things by determining and arranging them according to their common qualities. Dichotomous key is a key for determining the identity of the organism based on two choices in each set of characteristics. The dichotomous key for sharks are the shape of the body, number of gill slits, position of mouth, and shape of caudal fins. Other characteristics include length or number of dorsal fins, presence or absence of pelvic fins, anal head, and shape of head.
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In a population of plants, the allele for long stems (S) is completely dominant over the allele for short stems (s). If 35% of t
Sergio [31]

Answer:

The correct answer would be 48 percent.

It can be solved by using the Hardy-Weinberg equation.

p² +  2pq+ q²  = 1

p + q = 1

where, p² represents homozygous dominant's frequency that is, SS in this case,

q² represents homozygous recessive's frequency that is, ss in this case,

2pq represents heterozygous dominant's frequency that is, Ss in this case.

p represents dominant allele's frequency and q represents the recessive allele's frequency.

Now, the percentage of homozygous recessive or short stems is 35%. Therefore, the frequency of homozygous recessive would be 0.35.

Thus, the value of q² = 0.35

So, q = \sqrt{0.35} = 0.59 which is approximately equals to 0.6.

As p + q = 1 so, q = 1 - 0.6 = 0.4

The frequency of heterozygous (Ss) = 2pq = 2(0.6)(0.4) = 0.48

Hence, the frequency of heterozygous would be 48 percent.

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