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?
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WHAT IF? If the parental (P generation) flies had been true-breeding
for gray body with vestigial wings and black body with normal wings, which
phenotypic class(es) would be largest among the testcross offspring?
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- 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? 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? 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?
- Interpret the result of your Chi-squared test. How many gene pairs were responsible for eye color in flies as associated with sex? What gene interaction was present in the gene/s for eye color? What is the genotype of the possible P1 & P2 that produced this F2 population? (Remember to indicate your gene notation).WHAT IF? If maternal and paternal chromatids havethe same two alleles for every gene, will crossing overlead to genetic variation?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.
- Inquiry In a cross between a wild-type femalefruit fly and a mutant white-eyed male, what coloreyes will the F1 and F2 offspring have?WHAT IF? A horticulturalist breeds orchids, trying toobtain a plant with a unique combination of desirabletraits. After many years, she finally succeeds. To producemore plants like this one, should she crossbreed it withanother plant or clone it? Why?Question:- A) Give one domain.motif found in the SRY portion and state clearly how it leads to the development of the Wollfian system. B) Explain the genotype and the phenotype of an XY female and how such an individual could occur. C) Explain the genotype and the phenotype of an XX male and how such an individual could occur.
- Q1. How many genes are there in contig1? Q2. what are the names of these genes? Q3. Which gene ha the largest span (i.e, the largest distance between the start and the end of the gene)?3. You perform a cross between two true-breedingstrains of zucchini. One has green fruit and the otherhas yellow fruit. The F1 plants are all green, butwhen these are crossed, the F2 plants consist of9 green : 7 yellow.a. Explain this result. What were the genotypes of thetwo parental strains?b. Indicate the phenotypes, with frequencies, of theprogeny of a testcross of the F1 plants.c. Describe the epistasis interactions observed.d. Suppose that the dominant alleles specify functional enzymes, and the recessive alleles are nonfunctional. Propose a biochemical pathway thatcould explain the gene interactions.e. Is it possible to cross two different pure-breedingyellow zucchini strains and obtain all green progeny? What would be the genotypes of the parentsand progeny? f. Assuming that wild-type zucchini are green, howwould you describe the phenomenon that occurredin the F1 of part (e)?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?