2. If two A/a: B/b individuals have offspring, the probability that an offspring has both dominant traits is ¾/4 (T/F).
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Genetics Question 2
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- 3. If an individual with genotype Yy Ww Pp ee Bb is crossed with an individual with the same genotype, what proportion of offspring will have the dominant phenotype for the four heterozygous loci? answers: 81/256 81/128 27/256 3/163. Black coat (B) color in Cocker Spaniels is dominant, while red coat (b) color is recessive; solid pattern (S) is dominant, while spotted (s) pattern is recessive. Create a Punnett square that shows all of the possible offspring of a solid black male (BBSs) mated to a solid red female (bbSs). Include the percentage/ratio of occurrence for each phenotype. Include the percentage/ratio of occurrence for each phenotype.18. The following question refers to the pedigree chart in the figure below for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. What is the likelihood that the progeny of IV-3 and IV-4 will have the trait? (LS3-3) * 1 2 I ww Ww 2 3 4 8 II O III 2 3 4 IV 0% 50% 75% 100%
- 10. If B=brown eyes and b=blue eyes, and a man with brown eyes and a woman with blue eyes have a child with blue eyes, what is the genotype of the man for eye color? Assume complete dominance. * BB ВB or Bb Bb brown can't tell without more information1. If a man, dominant homozygote for tongue rolling, is expecting a child with a woman that is heterozygotic for the trait – what is the probability for their firstborn to be a daughter being dominant homozygotic for tongue rolling? 2. A color-blind female is expecting with a color seeing male – what is the probability of a male child to see color? 3. In Sweden 1/500 are born with an autosomal recessive disorder called thalassemia. What is the carrier frequency within the population?1. If the allelic composition of a gene is Aa, the genotype is said to be (homozygous, heterozygous). What is the probability of having "a" allele in gametes? 2. For a genotype of AaBb, what are the possible allele compositions in gametes? 3. What are the possible genotypes and phenotypes ("A" phenotype or "a" phenotype) in the offspring of a monohybrid cross Aa x Aa? 4. If the organism display a dominant phenotype for a trait ("A" phenotype), how does one determine if the genotype is homozygous or heterozygous? Please use the Punnett square to explain. 5. How many possible genotypes are there in the offspring of a dihybrid cross AaBb x AaBb? What are the possible phenotypes for such a cross? What is the phenotypic ratio for AB : Ab : aB : ab? D Focus 72°F DEA F4 PrtScr Insert Hor F5 F6 F7 F8 F9 F10 F11 F12 24 & 3. 8 E R T Y U
- 7. Instead of one big square it is much easier to make two small Punnett squares, one for each gene. In the space at the bottom of page, draw the two squares (from 4d and 5b on previous page). Indicate the phenotypic ratios for each square and then multiply to get the combined probabilities. For example, the probability of having both diseases requires multiplying the probability of each event. a. Is the inheritance of an "A" or "a" allele dependent on (or affected by) the inheritance of a "B" or b" allele? Why or why not? (hint: Which of Mendel's Laws is involved?) b. What is the chance that their child will be phenotypically normal (for both genes)? Show your work: c. What is the chance that their child will be genotype aabb (affected with both diseases)? Show your work: d. What is the chance that they will have a boy who has genotype AaBb (carrier for both diseases like his parents)? Show your work:19. If you cross a homozygous dominant individual with a heterozygous individual, what percentage of the offspring would display the dominant phenotype? 1. 0% 2. 25% 3. 50% 4. 75% 5. 100%5. When two alleles are observed independently in a phenotype is called multiple alleles. Human blood group ABO is a good example of multiple alleles. The three alleles are: I^, IB, i. Mother's blood type is AB (IAIP) and father's blood type is B (1³i). Provide the genotype and phenotype ratios using the Punnett square given below. Genotypes 6. When the allele of a trait is found on X or Y chromosome, it becomes sex-linked. The results differ from males to females. One such example is of red green colorblindness. The mother is a carrier (XCX), and the father is colorblind (XY). Provide the genotype and phenotype ratios using the Punnett square given below. Genotypes Phenotypes **CLUSTROS Phenotypes 75-1024
- 7. If the a and b loci are 20 m.u. apart in humans and anA B / a b woman mates with an a b / a b man, what isthe probability that their first child will be A b / a b?3. Set up a Punnett square using the following information: Dominate allele for purple corn kernels = R Recessive allele for yellow corn kernels =r Dominate allele for starchy kernels = T Recessive allele for sweet kernals =t Cross a homozygous dominant parent with a heterozygous parent. Using the Punnett square above: a. What is the probability of producing purple, starchy corn kernels? Possible genotype(s)? b. What is the probability of producing yellow, starchy corn kernels? Possible genotype(s)? c.What is the probability of producing purple, sweet corn kernels? Possible genotype(s)? d. What is the probability of producing yellow, sweet corn kernels? Possible genotype(s)?2. In a family of seven children, what is the probability of obtaining the following numbers of boys and girls? (a) All boys (b) All children of the same sex (C) Six girls and one boy I (d) Four boys and three girls