Is Long Eyelashes Dominant or Recessive

Dad ff Mother FF Sam Ff 9. In humans, freckles is dominant over no freckles. Sam has freckles and his mother had freckles, but his father and sister do not. What are the genotypes of all of the members of the family?   F f F FF Ff f Ff ff 10. A cross between a white snapdragon and a red snapdragon produces pink snapdragons. Draw a Punnett square for this cross. What are the genotypes and phenotypes of the offspring? Draw a Punnett square and determine the genotypes and phenotypes of the F2 offspring. R W R RR RW W RW WW All offspring Pink. 11. A man with type AB blood and a lady with O type blood have a child. What are the possible blood types of this child? Can both parents donate blood to their child? Why or why   not? Include antigens and antibodies in your explanation. AB and B No, only O type blood can donate blood to a child with AB blood type. Type A and B blood have antibodies against type B and A blood respectively. 12. Colorblindness is an X-linked recessive trait. A carrier female and a normal male want to have kids. Describe the gender and vision of their possible offspring. Girls:   All fine Boys: 50% chance of color blindness 13. A man with type AB blood and woman with type A blood have four children. The children’s blood types are A, B, AB, and O. What are the genotypes of the parents? I^A I^B and I^A i 14. If red flowers were crossed with yellow flowers and orange flowers resulted, would it be possible to cross orange flowers to get red and yellow flowers again? Explain. Yes, orange is both yellow and red alleles (heterozygous). Crossing them can result in purebred red and yellow. 15. In pea plants, round seeds (R) are dominant over wrinkled (r) and yellow (Y) seeds are dominant over green (y) seeds. A plant heterozygous for color but homozygous dominant for seed shape is crossed with a plant that is homozygous recessive for both traits. What are the genotypic and phenotypic ratios of the offspring? 50% Yellow round/50% Green round. 16. If the genotype is YySsTt, then what does ySt represent? recessive/dominant/recessive (gamete) 17. In humans, brown hair (B) is dominant over blonde hair (b), and brown eyes (E) are dominant over blue eyes (e). What is/are the genotype(s) of a blonde haired, brown eyed person? bbEE or bbEe 18. In humans, long eyelashes are dominant over short eyelashes. If the father is homozygous   with short eye lashes and the mother is heterozygous, describe their possible offspring. 50% long eyelashes and 50% short eyelashes 19. The gene for scaly skin is X-linked. If a scaly skinned male and a carrier female have kids, what are the possible genotypes and phenotypes of the offspring? 1 scaly skinned girl/1 scaly skinned boy/1 normal girl/1 normal boy 20. There is a breed of cattle which produces good meat when a particular gene is heterozygous. The same gene is lethal when it is homozygous recessive. To produce the best beef possible without losing any cattle, what should a rancher   do? Cross homozygous dominant with heterozygous cattle. 50% will be good meat and 50% poor. Science 10 Honours Genetics Problems 2 Warning: Be careful! You do these problems. There is a mixture of Mendelian genetics, codominance, incomplete dominance, and sex linkage. 1. In humans, the allele that codes for an ability to taste PTC   (T) is dominant, and the allele that codes for an inability to taste this chemical is recessive (t). A male who is heterozygous for this trait marries a female who cannot taste PTC. a. What are the genotypes of the male and female? b. Draw a Punnett square to show the possible genotypes of their offspring. c. What is the predicted percentage of their offspring that will be able to taste PTC?   50% d. What is the predicted percentage of their offspring that will not be able to taste PTC? 50% 2. Imagine that a group of sasquatches have been discovered in the mountains of British Columbia. The scientists studying them observe three pairs, each with several offspring. Phenotypes of   the parents and each of their offspring are given in the table for one easily observable trait: the presence or absence of hair on their toes. What do you predict are the genotypes of the parents in each of these three pairs? | Pair number | Male parent | Female parent | Offspring | |---|---|---|---| | 1   | Hairy toes | Hairy toes | ½ hairy toes, ½ smooth toes | | 2 | Hairy toes | Hairy toes | All hairy toes | | 3 | Smooth toes | Hairy toes | ½ hairy toes, ½ smooth toes | 3. Imagine that you have two pure lines for each of three species of plants. For each species, one pure line produces only blue flowers and the other pure line produces only red flowers. You do a series of crossing experiments on each species. For species #1, you find that the flowers of the   F₁ offspring are all blue. The flowers of the F₁ offspring of species #2 have a mottled (spotted) red and blue appearance. For species #3, the F₁ offspring all have purple flowers. Explain the inheritance for each species. #1: **Dominant** #2: **Codominance** #3: **Incomplete Dominance** 4. Can a male be a carrier of an X-linked trait, but not have the disease? Explain. No, if X-linked he either has the disease or is missing portion of chromosome allele to not have disease. 5. In the fruit fly, long wings (L) is dominant over short wings (l). What results would be obtained when a heterozygous fly is crossed with a short-winged fly? Show the Punnett square and report both the phenotypes and genotypes of the offspring.   [Punnett square] Twenty-five percent of the offspring are short-winged and seventy-five percent are long-winged. 6. Twenty-five percent of the offspring of a certain pair of white sheep are black. Which trait is dominant? What are the genotypes of the parents? White   colouring dominant. Bb x Bb 7. A brown mink is crossed with a silver-blue mink. All the offspring are brown. When these F₁ mink were crossed among themselves, they produced 47 brown animals and 15 silver-blue animals. Determine all the genotypes and determine which is the dominant trait. Brown is dominant. 8. Albinism in plants is a lethal trait yet many species of plants produce albinos among their offspring. If albinos always die before reproducing, why does the recessive allele not become eliminated? Being heterozygous for albinism has an advantage for survival.