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- Let us suppose that two long-winged flies were crossed and that 77 long-winged and 24 short-winged specimens were counted in the offspring. a. Will the short-winged character be dominant or recessive?B. What will the genotypes of the parents be?C. What is the observed genotype ratio?In a population of rabbits, you find three differentcoat color phenotypes: chinchilla (C), himalaya (H),and albino (A). To understand the inheritance of coatcolors, you cross individual rabbits with each otherand note the results in the following table.Cross number Parental phenotypes Phenotypes of progeny1 H × H 3/4 H : 1/4 A2 H × A 1/2 H : 1/2 A3 C × C 3/4 C : 1/4 H4 C × H all C5 C × C 3/4 C : 1/4 A6 H × A all H7 C × A 1/2 C : 1/2 A8 A × A all A9 C × H 1/2 C : 1/2 H10 C × H 1/2 C : 1/4 H : 1/4 Aa. What can you conclude about the inheritance ofcoat color in this population of rabbits?b. Ascribe genotypes to the parents in each of the10 crosses.c. What kinds of progeny would you expect, and inwhat proportions, if you crossed the chinchilla parents in crosses 9 and 10?Given a cross between AabbCcDdEeFFGgHh x AaBbCcDdEEffggHH, a) how many possible gametes can the first individual produce? b) what proportion of the offspring will phenotypically resemble the first parent? c) what proportion of the offspring will genotypically resemble the second parent? d) how many phenotypes can be expected from the cross?
- In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal (healthy) allele is dominant (A). What is the genotype of someone who has cystic fibrosis? What are the two different genotypes that a healthy person could have? If two people were both heterozygous for the cystic fibrosis gene, what fraction of their children would be likely to have this disease? Hint: Draw a Punnett square to figure it out.If two gene pairs A and a and B and b are assorting independently with A dominant to a and B dominant to b, what is the probability of obtaining: a. an AB gamete from an AaBb individual? b. an AABB zygote from an AaBb x AaBb cross? c. an aaBb offspring from an AaBB x aabb cross? d. a phenotype aB from an Aabb x aaBb cross? e. an ab gamete from an aaBB individual?A cross between two heterozygous individuals in one gene resulted in one phenotype, explain?
- If two genes on the same chromosome exhibit complete linkage, what is the expected F2 phenotypic ratio from a selfed heterozygote with the genotype a + b + ⁄⁄ ab?Using the pedigree chart attached: Above is a pedigree for colorblindness. Based on the pedigree, is the disease dominant or recessive and is it sex-linked or autosomal? Why? Furthermore, what is the probability that 18 on this chart is affected but the condition, and what is the probability that 18 is a carrier? Why? Are the probability of being a carrier and an affected individual different? Why?In humans, brown eyes (B) are dominant over blue. A brown eyed man marries a blue-eyed (b) woman and they have three children two of whom are brown-eyed and one of whom is blue-eyed. if the male has brown eyes but has a blue-eyed child, what must his genotype be?
- The father of two children is type O+, and the mother is type A+. The children are O- and A+. Given this information, what are the genotypes of the father vs. the mother at both the “I” and “Rh” alleles? Explain your rationale.Let’s suppose a genetic disease is caused by a mutantallele. If two affected parents produce an unaffected offspring, can themutant allele be recessive?A man with blood type O (genotype ii) has a father with blood type A and a mother with blood type B. Is this man a legitimate child of these parents? What is a possible phenotype of an individual that results from a woman with type AB blood and a man with type B blood? Explain with diagrams.