WHAT IF? In 2005, Icelandic scientists reported findinga large chromosomal inversion present in 20% of northern Europeans, and they noted that Icelandic womenwith this inversion had significantly more children thanwomen without it. What would you expect to happento the frequency of this inversion in the Icelandicpopulation in future generations?

WHAT IF? In 2005, Icelandic scientists reported findinga large chromosomal inversion present in 20% of northern Europeans, and they noted that Icelandic womenwith this inversion had significantly more children thanwomen without it. What would you expect to happento the frequency of this inversion in the Icelandicpopulation in future generations?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter19: The Evolution Of Populations

Section: Chapter Questions

Problem 18CTQ: Imagine you are trying to test whether a population of flowers is undergoing evolution. You suspect...

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WHAT IF? Suppose males in the first mating had a mutant allele thatresulted in smaller eyes as a dominant trait (see Concept 14.1). What fractionof the females would produce some offspring with smaller eyes?
WHAT IF? If maternal and paternal chromatids havethe same two alleles for every gene, will crossing overlead to genetic variation?
WHAT IF? List all gametes thatcould be made by a pea plantheterozygous for seed color, seedshape, and pod shape (YyRrIi; seeTable 14.1). How large a Punnettsquare would you need to drawto predict the offspring of a selfpollination of this “trihybrid”?
WHAT IF? A chicken has 78 chromosomes in its somaticcells. How many chromosomes did the chicken inheritfrom each parent? How many chromosomes are in eachof the chicken’s gametes? How many chromosomes willbe in each somatic cell of the chicken’s offspring?
WHAT IF? If the parental (P generation) flies had been true-breedingfor gray body with vestigial wings and black body with normal wings, whichphenotypic class(es) would be largest among the testcross offspring?
WHAT IF? Propose a possible reason that the firstnaturally occurring mutant fruit fly Morgan sawinvolved a gene on a sex chromosome and was foundin a male.
WHAT IF? Males afflicted with Kartagener’s syndromeare sterile because of immotile sperm, and they tend tosuffer from lung infections. This disorder has a geneticbasis. Suggest what the underlying defect might be.
WHAT IF? If the frequency of the CRallele were 0.6, predict the frequenciesof the CRCR, CRCW, and CWCW genotypes.
10. Horn length in the Sable antelope of Africa involves recessive epistasis. Gene Lcontrols the length of the horns. LLC_ have very long horns, LlC_ have medium sized horns, and llC_ have short horns. Antelope with no horns are always __cc. How would you deduce the genotype of a hornless antelope? cross two hornless antelope together you cannot deduce the genotype with a single breeding experiment cross it with an antelope of genotype llCC. cross it with an antelope of genotype llcc
Imagine you are trying to test whether a population of flowers is undergoing evolution. You suspect there is selection pressure on the color of the flower: bees seem to cluster around the red flowers more often than the blue flowers. In a separate experiment, you discover blue flower color is dominant to red flower color. In a field, you count 600 blue flowers and 200 red flowers. What would you expect the genetic structure of the flowers to be?
10 is the problem solver to help you What is the probability of getting dimpled offspring ? What is the probability of getting offspring with no dimples ? What is the probability of getting homozygous offspring ?
MAKE CONNECTIONS The ABO blood type locus hasbeen mapped on chromosome 9. A father who has typeAB blood and a mother who has type O blood have achild with trisomy 9 and type A blood. Using this information, can you tell in which parent the nondisjunctionoccurred? Explain your answer. (See Figures 14.11and 15.13.)