Biology, 25.11.2020 08:40, douglastheboy

En Drosophila existe una mutación llamada Curly (Cy) que da lugar a que el ala se curve hacia arriba. Cuando se cruza un macho Cy con una hembra virgen Cy, la F1 está formada por 207 moscas Cy y 101 moscas normales. ¿Puede proponer una hipótesis para explicar estos resultados?

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answered: zaiibaii

Cy es un alelo letal en homocigosis

Explanation:

Alelos:

Cy: alas curvadas y N: alas normales

Cruzamiento: CyN (macho) x CyN (hembra)

F1: 207 Cy + 101 normales (2/3 alas curvadas y 1/3 alas normales)

Cuando se cruzan 2 ejemplares heterocigotas para un gen con dominancia incompleta, la proporción fenotípica que uno espera en la progenie será 1:2:1 (1 homocigota dominante, 2 heterocigotas y 1 homocigota recesivo). En este caso solamente se observan dos fenotipos: moscas con alas normales y moscas con alas curvadas (Cy), con una proporción fenotípica de 1:2. En consecuencia, si Cy es un gen letal en homocigosis, la proporción fenotípica será 2/3 CyN y 1/3 NN, lo cual se ajusta a una proporción fenotípica de 1:2 y a los valores esperados en la prueba de chi cuadrado χ² obtenidos usando los datos del experimento, es decir, 207 moscas Cy y 101 moscas normales:

Observados Esperados

207 308 x 2/3 = 205,3

101 308 x 1/3 = 102,7

answered: Guest

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients: open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures: the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

answered: Guest

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

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En Drosophila existe una mutación llamada Curly (Cy) que da lugar a que el ala se curve hacia arriba...