In freesias (a type of lily), a cross was made between a red-flowered male with
ID: 187411 • Letter: I
Question
In freesias (a type of lily), a cross was made between a red-flowered male with smooth leaves and a yellow-flowered female with rough leaves. The F1 generation consisted of male and female plants with red flowers and smooth leaves. When the F1 males and females are crossed, the F2 offspring consisted of 16 red-flowered females with rough leaves, 48 red-flowered females with smooth leaves, 15 yellow-flowered females with rough leaves, 49 yellow-flowered females with smooth leaves, 31 red-flowered males with rough leaves and 97 red-flowered males with smooth leaves.
1. What is the best explanation for the genetic basis of red flower color?
autosomal dominant
autosomal recessive
sex-linked dominant
sex-linked recessive
there are not enough data to tell
QUESTION 2
What is the best explanation for the genetic basis of rough leaves?
autosomal dominant
autosomal recessive
sex-linked dominant
sex-linked recessive
there are not enough data to tell
QUESTION 3
If you cross an F2 female red flowers and smooth leaves to an F1 male, what type of offspring are you unlikely to see?
females with yellow flowers and rough leaves
females with red flowers and rough leaves
females with yellow flowers and smooth leaves
males with red flowers and rough leaves
males with yellow flowers and rough leaves
autosomal dominant
autosomal recessive
sex-linked dominant
sex-linked recessive
there are not enough data to tell
Explanation / Answer
a) autosomal dominant. There is no difference between males and females, so no reason to suspect sex linkage. and all parents are affected.
b) Autosomal recessive.There is no difference between males and females, so no reason to suspect sex linkage. and no one parent is affected.
c)after cross we found -
females with yellow flowers and rough leaves
females with yellow flowers and smooth leaves
males with red flowers and rough leaves