1) Cross 2: Parental Red Eyed Female with Parental White Eyed Male Number of Red
ID: 64216 • Letter: 1
Question
1) Cross 2: Parental Red Eyed Female with Parental White Eyed Male
Number of Red eye Male Offspring: 47 Number of White eye Male Offspring: 0
Number of Red eye Female Offspring: 53 Number of White eye, Female Offspring: 0
Why are there no white eyed offspring?| Think about the genetics – this question will have a different answer to the previous question.
2) Parental White Eyed Female with Parental Red Eyed Male
Number of Red eye Male Offspring: 0 Number of White eye Male Offspring: 51
Number of Red eye Female Offspring: 49 Number of White eye, Female Offspring: 0
If white is recessive, how did you get white flies in this generation? Why are all the white flies from this cross male?
Explanation / Answer
1). Cross between a dominant red eyed female and recessive white eyed male will have the offspring with the following genotypes. Consider the red eye allele R is dominant to W (white eye).
RR* ww = 100% Rw.
Means, all the offspring are red eyed, of which 50% are males and another 50% are females. As R is dominant to W, there is no white eyed offspring.
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