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- 17. Who would be more likely to display a recessive X linked trait (like color blindness) 1. Male because they only have one X chromosome 2. Females because they have two X chromosome 3. Females and males are like display X linked recessive traits with equal frequency13. Which of the following is true regarding X linked recessive traits? More males are affected than females because they have nothing to maska recessive allele carried on the X chromosome More females are affected than males because they have nothing to mask a recessive allele carried on the X chromosome. More females are affected than males because they have an extra X More males are affected than females because they have an extra X4. In the pedigree shown, the trait is most likely caused by what type of inheritance? X-linked dominant autosomal recessive autosomal dominant X-linked recessive
- 9. In fruit flies, eye color is carried on the X chromosome. The allele for red eyes is dominant over its recessive allele, white eyes. Cross a homozygous, red-eyed female to white-eyed male. white cefes red eyes What is the genotype of the male? What is the genotype of the female? X xxx xx Y XY XY Genotypes x' x X Y How many genotypes are possible among the offspring? How many phenotypes are possible among the offspring? What is the probability of getting offspring that are red-eyed males? What is the probability of getting offspring that are white-eyed males? What is the probability of getting offspring that are red-eyed females? What is the probability of getting offspring that are white-eyed females? Phenotypes red eyes white eyes1. y-linked recessive 2. autosomal recessive 3. autosomal dominant 4. X-linked dominant 5. Pleiotrophic 6. X-linked recessive5. Red-Green colour blindness is inherited as an X-linked recessive trait in humans. A woman, who’s mother had red-green colour blindness marries a colour blind man. What are the chances that their child will be: 1. a colour-blind male? 4. a normal male? 2. a colour blind female? 5. a normal female? 5. The couple has a colour blind male child. What are the chances that their next child will be a normal female?
- 18. A disease that is sex-linked means the gene for it is located on the X or Y chromosme, rather than the 22 pairs of somatic chromosomes. An example of such a disease is O HEPATITIS O LEUKEMIA O COLOR BLINDNESS O TRISOMY 211M sex cell 9. the passing of traits from parent to offspring 20. phenotype h. an egg or sperm 21, sex chromosomes i pair of chromosomes that determine the organism's sex 22. recessive trait j, an organism's inherited appearance 3. Children are born to a father that is heterozygous for widow's peak and a mother that hasE straight hairline, Show the following information. Parents: Genotypes: Phenotypes: Genotypic Ratio: Phenotypic Ratio: 4. Mom has type A blood and dad has type B. Show how they can have a child with type O blood. Parents: O Child's genotype:.4. What is the probability that an egg carrying an X chromosome will be fertilized by sperm carrying an X-chromosome? 0 0 O 1/4 01 O 1/8 O 1/2
- 3. The father shown beiow has Hemophilia, an X-linked recessive disorder. If this couple had a son, could the son have the disease? What genotype(s) would be possible for that son?4. A girl has green-red CVD (colour vision deficiency) which is an X-linked recessive trait. What are the possible genotypes of each of her parents? Mother: Father:3. In humans, hemophilia is a sex linked trait. Females can be normal, carriers, or have the disease. Males will either have the disease or not (but they won't ever be carriers). Show the cross of a man who has hemophilia with a woman who is a carrier. XH XH = female, normal XH Xh= female, carrier xh Xh= female, hemophiliac XH Y = male, normal Xh Y= male, hemophiliac 4. What is the probability that their children will have the disease? 5. A woman who is a carrier "marries" a normal man. Show the cross. What is the probability that their children will have hemophilia? What sex will a child in the family with hemophilia be? 6. In a certain cactus, prickly spines can be two pronged or one pronged. If a true breeding one- pronged cactus is crossed with a true breeding two-pronged cactus, the F1 generation has a mixture of spines, some are two-pronged, some are one-pronged. a. Is this an example of codominance or incomplete dominance? b. Show the F2 generation (a cross between the two…