A white eyed male Drosophila is crossed to a red eyed female all the resulting progeny have red eyes.
A. This shows that eye colour is sex linked.
B. This shows that eyes are recessive to white eyes.
C. Both of the above.
D. None of the above
I think it is C. Am I right ?
Please help me
To be sex linked... the sex is related to the outcome.
They said all progeny... so I assume that it would be both male and female. since they all have red eyes, I would think it is B.
To determine the correct answer to the given question, we need to analyze the information and understand the principles of genetics involved.
In Drosophila (fruit flies), eye color is determined by a single gene with two alleles: white (w) and red (w+). The white eye allele is recessive to the red eye allele.
When a white-eyed male (WW) is crossed with a red-eyed female (w+w+), according to Mendelian genetics, we would expect the progeny to inherit one allele from each parent. In this case, since the white-eyed male has only white eye alleles, all the progeny would inherit the red eye allele from the female.
Now let's evaluate each option:
A. This shows that eye color is sex-linked: This option is incorrect because the information provided does not specify any sex-linked inheritance patterns. Sex-linked traits are determined by genes located on the sex chromosomes, such as the X or Y chromosome.
B. This shows that eyes are recessive to white eyes: This option is also incorrect. The white eye allele is recessive to the red eye allele. Therefore, in this cross, if progeny had white eyes, it would indicate that the white-eyed allele is dominant.
C. Both of the above: Since option A and B are incorrect, this option is also incorrect.
D. None of the above: Based on the analysis, this is the correct option. The information provided does not support either option A or B.
Therefore, the correct answer is D. None of the above.