S-SHAPED CURVE

If there is no canalization of a developmental pathway, genetic variation of pathway components results in a continuous spectrum of phenotypes, often distributed in a bell curve.

en.wikipedia.org

This had been tried in the late 19th century but was not found satisfactory at the time.

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在《PONS词典》中的词汇

S.D. 美

SD 缩略自： South Dakota

South Da·ko·ta 名词 [dəˈkəʊtə, 美 -ˈkoʊ-]

shaped [ʃeɪpt] 形 不变的

1. shaped (in shape):

2. shaped (likely to become):

S <pl 's [or -s]>, s <pl 's> [es] 名词

A5 名词 INV-FIN

A4 名词 英

A 缩略自： A level

A3 名词

A 缩略自： answer

A2 名词

A 缩略自： ampere

A1 <pl -'s [or -s]> [eɪ] 名词

1. A (hypothetical person, thing):

2. A (blood type):

3. A 法律:

短语，惯用语:

A <pl -s [or -'s]>, a <pl -'s [or -s]> [eɪ] 名词

1. A (letter):

2. A 音乐:

3. A (school mark):

4. A 金融:

s <pl ->

s 缩略自： second

se·cond3 [sɪˈkɒnd] 动词 trans usu passive 英, 澳

sec·ond2 [ˈsekənd] 名词

1. second (sixtieth of a minute):

2. second (very short time):

3. second 数学:

I. sec·ond1 [ˈsekənd] 形 不变的

1. second usu attr (next after first):

2. second (next after winner):

3. second (not first in importance, size):

4. second attr (another):

短语，惯用语:

II. sec·ond1 [ˈsekənd] 名词

1. second (order):

2. second (date):

3. second (in titles):

4. second 英 大学:

5. second no pl 汽车:

6. second (extra helping):

7. second 英 俗 (dessert):

8. second (imperfect item):

9. second (assistant in boxing or duel):

10. second (in ballet):

11. second (in baseball):

12. second (musical interval):

13. second (seconder):

III. sec·ond1 [ˈsekənd] 副 不变的

1. second (secondly):

2. second (in second class):

IV. sec·ond1 [ˈsekənd] 动词 trans

1. second (support formally in debate):

2. second 书 (back up):

3. second 经济:

4. second 法律, 政治:

I. S1 名词 no pl

S 地理 → south

II. S1 形 地理

south·ern [ˈsʌðən, 美 -ɚn] 形

I. south [saʊθ] 名词 no pl

1. south (compass direction):

2. south (southern part of England):

3. south:

4. south (southern states of the USA):

II. south [saʊθ] 形

1. south (opposite of north):

2. south 引 俗 (downwards in terms of quality/quantity):

III. south [saʊθ] 副

south (toward the south):

短语，惯用语:

S2 名词

S 教育, 大学 缩略自： satisfactory

shaped [ʃeɪpt] 形不变的

A⁵ 名词 INV-FIN

A⁴ 名词英

A³ 名词

A² 名词

A¹ <pl -'s [or -s]> [eɪ] 名词

se·cond³ [sɪˈkɒnd] 动词 trans usu passive 英, 澳

sec·ond² [ˈsekənd] 名词

I. sec·ond¹ [ˈsekənd] 形不变的

II. sec·ond¹ [ˈsekənd] 名词

4. second 英大学:

7. second 英俗 (dessert):

III. sec·ond¹ [ˈsekənd] 副不变的

IV. sec·ond¹ [ˈsekənd] 动词 trans

I. S¹ 名词 no pl

II. S¹ 形地理

2. south 引俗 (downwards in terms of quality/quantity):

S² 名词

S 教育, 大学缩略自： satisfactory

S³ 形

S 时尚缩略自： small

S.O.B. [美 ˌesoʊˈbi:] 名词美贬俗

son of a ˈbitch <pl sons of bitches>, son·of·a·ˈbitch <pl -es> 名词美粗

bell(-shaped) curve 名词金融