Brown hair (H) is dominant to blonde hair (h). Brown eyes (B) are dominant to blue eyes (b).Rebecca has blue eyes and is heterozygous for hair color. Her husband Thomas, has blue eyes and blonde hair.Complete a dihybrid Punnett square (use a scratch paper), determine the phenotypic ratio of thier kids.Responses50% brown eyes and blond hair, 50% brown eyes and blond hair.50% brown eyes and blond hair, 50% brown eyes and blond hair.25% blue eyes and brown hair, 75% blue eyes and blond hair.25% blue eyes and brown hair, 75% blue eyes and blond hair.100% blue eyes and brown hair, 0% blue eyes and blond hair.100% blue eyes and brown hair, 0% blue eyes and blond hair.50% blue eyes and brown hair, 50% blue eyes and blond hair.
Question
Brown hair (H) is dominant to blonde hair (h). Brown eyes (B) are dominant to blue eyes (b).Rebecca has blue eyes and is heterozygous for hair color. Her husband Thomas, has blue eyes and blonde hair.Complete a dihybrid Punnett square (use a scratch paper), determine the phenotypic ratio of thier kids.Responses50% brown eyes and blond hair, 50% brown eyes and blond hair.50% brown eyes and blond hair, 50% brown eyes and blond hair.25% blue eyes and brown hair, 75% blue eyes and blond hair.25% blue eyes and brown hair, 75% blue eyes and blond hair.100% blue eyes and brown hair, 0% blue eyes and blond hair.100% blue eyes and brown hair, 0% blue eyes and blond hair.50% blue eyes and brown hair, 50% blue eyes and blond hair.
Solution
Rebecca's genotype for hair color is Hh (heterozygous), meaning she carries both the dominant brown hair gene and the recessive blonde hair gene. Her genotype for eye color is bb (homozygous recessive), meaning she only carries the recessive blue eye gene.
Thomas's genotype for hair color is hh (homozygous recessive), meaning he only carries the recessive blonde hair gene. His genotype for eye color is also bb (homozygous recessive), meaning he only carries the recessive blue eye gene.
When we cross these genotypes in a dihybrid Punnett square, we get the following possible genotypes for their children:
- Hhbb: This child would have brown hair (because the dominant brown hair gene is present) and blue eyes (because both eye color genes are recessive blue).
- hhbb: This child would have blonde hair (because both hair color genes are recessive blonde) and blue eyes (because both eye color genes are recessive blue).
So, the phenotypic ratio of their children would be:
- 50% with brown hair and blue eyes
- 50% with blonde hair and blue eyes
Therefore, the correct answer is: 50% blue eyes and brown hair, 50% blue eyes and blond hair.
Similar Questions
Brown hair (H) is dominant to blonde hair (h). Brown eyes (B) are dominant to blue eyes (b).Rebecca has blue eyes and is heterozygous for hair color. Her husband Thomas, has blue eyes and blonde hair.What are the genotypes of Rebecca and Thomas? ResponsesRebecca = bbHH; Thomas = bbhhRebecca = bbHH; Thomas = bbhhRebecca = bbHh; Thomas = BbhhRebecca = bbHh; Thomas = BbhhRebecca = BBHh; Thomas = BbhhRebecca = BBHh; Thomas = BbhhRebecca = bbHh; Thomas = bbhh
Brown hair (H) is dominant to blonde hair (h). Brown eyes (B) are dominant to blue eyes (b).Rebecca has blue eyes and is heterozygous for hair color. Her husband Thomas, has blue eyes and blonde hair.Using FOIL method, what are the possible gamete combinations?ResponsesRebecca = bH, Bh; Thomas = BhRebecca = bH, Bh; Thomas = BhRebecca = bH, bh; Thomas = bhRebecca = bH, bh; Thomas = bhRebecca = BH, bh; Thomas = bhRebecca = BH, bh; Thomas = bhRebecca = BH, bh; Thomas = Bh
In humans, brown eyes (B) are dominant, and blue eyes (b) are recessive.Which of the following genotypes would give the offspring brown eyes?BBBbbBbb
The allele for blue eyes is "t" while the allele for brown eyes is "T". What percentage of offspring produced by two parents with blue eyes would also have blue eyes?*0%25%50%100%
2. A study found that children with light-coloured eyes are likely to have parentswith light-coloured eyes. On this basis, can we say anything about whether thelight eye colour trait is dominant or recessive? Why or why not?3. Outline a project which aims to find the dominant coat colour in dogs.4. How is the equal genetic contribution of male and female parents ensured inthe progeny?Rationalised 2023-24
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