quiz 3 - Initial crosses indicate that R is dominant to r...

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MCB 2410 Name _____________________ Spring 2009 Quiz #3 Section _____________ 1. Which sex is more likely to express an x-linked recessive phenotype? male or XY (+1) 2. For a given trait, what designation is used for an individual having the same allele for a gene on homologous chromosomes? homozygous (+1) 3. Assuming normal Mendelian inheritance, how many alleles for each gene does a gamete contain? one (+1) 4. In families where both parents are heterozygous for a recessive trait, what is the probability of having a child with a homozygous recessive genotype? ¼ (+1) 5. In a family of 2 boys and 3 girls, what is the chance of having a third boy? ½ (+1) You discover a new dragonfly species that has either red ( R ) or clear ( r ) wings.
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Unformatted text preview: Initial crosses indicate that R is dominant to r. You perform a cross using red-winged parents with unknown genotype and observe the following data: P red-winged x red-winged F 1 76 red-winged and 20 clear-winged 7-8. What are the probable genotypes of the parents? Female: Rr (+1) Male: Rr (+1) A cross between a different pair of red-winged dragonflies yields the following progeny: P red-winged x red-winged F 1 96 red-winged 9-10. What are the probable genotypes of these parents? Female: RR (+1) Male: RR or Rr or rr (+1) Inverse is also possible 6. What would you do to test how well the observed phenotypic values fit the expected values of these dragonfly crosses? chi-square test (+1)...
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This note was uploaded on 05/08/2009 for the course MCB 2410 taught by Professor Nelson during the Spring '08 term at UConn.

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