Genetics problem
Bio3011- Genetics Summer 2024 Solve the following problems: a) Clouded leopards are a medium-sized, endangered species of cat living in Central America’s very wet cloud forests. Assume that the normal spots, pictured here, are a dominant, sex-linked trait and that dark spots are recessive. What would be the genotypic ratio if a Normal male leopard was crossed with a dark-spotted female leopard? b) Using the information in the question above, suppose a male and female leopard have four cubs and, conveniently, two are male and two female. Each of the male and female cubs has normal spots and one each has dark spots. What is the genotype and phenotype of the leopard parents? 2. a) The bison herd on Konza Prairie has begun to show a genetic defect. Some of the males have a condition known as “rabbit hock” in which the knee of the back leg is malformed slightly. Assume the genes controlling this trait are sex-linked and that the “rabbit hock” is recessive. Now, suppose that the herd bull is normal and mates with a cow that is a carrier for rabbit hock. What are the chances of producing a normal son? b) If this bull mates with this cow every year, what percentage of their daughters will have normal knees? c) What percentage of their daughters will be carriers of rabbit hock? 3. A rancher owns a bull with many desirable characteristics. Unfortunately, he also has a sex-linked trait that in the recessive form leads to no pigment formation in the iris of the eye. This makes the bull very sensitive to sunlight and could lead to blindness. The rancher wishes to breed him to a cow which will minimize the chances of any offspring showing this trait. She would especially like to produce another bull with most of his sire’s desirable qualities but without the nonpigmented eye. a) Two cows with the dominant normal colored eyes ( XN ) are available that have been genetically typed for this particular trait. Cow 1 has a genotype of XN XN and cow 2 is of XN Xn. Which of these two cows should the rancher choose as a mate to her bull if she wishes to minimize the occurrence of the non-pigmented eye in his offspring? b) What percentage of the male offspring from the preferred cross will have non-pigmented eyes?
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