1. Color blindness is X-linked recessive and blood type is autosomal. If two par

Question

1. Color blindness is X-linked recessive and blood type is autosomal. If two parents who are both Type A and have normal vision produce a son who is color blind and type O, what is the probability that their next child will be a son who has normal vision and is blood type A?

2. In a cross of two flies +/vg Cy/+ +/se +/ab X +/vg +/+ se/se ab/ab what proportion of the offspring will be mutant in phenotype for all four markers?

3.Color blindness is X-linked recessive and blood type is autosomal. If two parents who are both Type A and have normal vision produce a son who is color blind and type O, what is the probability that their next child will be a female who has normal vision and is type O?

4.scalloped (sd) is an X-linked recessive and ebony (e) is an autosomal recessive mutation. What proportion of scalloped, ebony females (relative to whole population) is expected in the F2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony?

5.Color blindness is X-linked recessive and blood type is autosomal. If two parents who are both Type A and have normal vision produce a son who is color blind and type O, what is the probability that their next child will be a son who has normal vision and is blood type A?

6. A husband and wife have normal vision, although both of their fathers are colorblind. What is the probability that their first child will be a daughter who is colorblind?

Explanation / Answer

1. color blindness and blood type are two different follow different types of genetic transmission concepts.

If both the parents were having A blood group and the son has o blood group then the genotype of the parents will be Ia Io and Ia Io which final will become IoIo so the child will be of O type blood group and as the child is color bling also because, The child is a boy , So Xc Y will the genotype because even if the sex linked gene is recessive . it will show its impact over it.

The probability for next child being A blood group is 75% and child being normal is 100 percent. because now the gene without color blindness will combine with the Y gene.

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