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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Answer from: 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

Answer from: Quest

fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals

Answer from: Quest

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

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

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