BIOL3044 Lecture Notes - Lecture 32: Helianthus Petiolaris, Helianthus Annuus, Quantitative Trait Locus

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indigobat594

13 Nov 2021

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Dalhousie University

Department

Biology

Course

BIOL3044

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Here we have a genetic map of 5 of the chromosomes from h. anomalus (the hybrid: chromosomes 1, 5, 7, 9, 10. The dots matching with the bars is true for all 3 sunflower hybrids (anomalus, paradoxus, deserticola: whichever the qtl allele that acts in direction of the new species (smaller/larger flower, deeper roots, etc. ), is the allele that is present in that new species: qtl mapping confirms that desert sunflowers have. Put together" the alleles from the two parents that give it an extreme phenotype, allowing them to live in an extreme environments when neither parents can. There is a possibility that evolving to adapt to the desert environment was evolution along a genetic line of least resistance. 2 chromosome segments: instead of showing generally that there is a qtl in that location, it shows where the mapping result for qtl are for a whole bunch of traits: each section of chromosome shows.

Related Questions

In âpainted tongueâ plants, wild type flowers are red, but many other flower color variants have been isolated and some of them breed true, including blue and lavender. A geneticist finds that alleles of a single gene determine whether flowers are red, blue or lavender.

Results of some of her crosses are shown here:

True-breeding parents F1 progeny F2 progeny (self-pollinating F1s)

red x blue All red 102 red, 33 blue

Red x lavender All bronze 84 bronze, 43 red, 41 lavender

a. Indicate the relationship between the alleles that display red x blue traits, and the relationship between the alleles that display red and lavender traits.

b. If the bronze F1 progeny of the red x lavender cross are crossed with true-breeding red plants, what progeny classes do you expect to find in what proportions?

bluegnat979

1). Explain the significance of the fact that gametes contain half of the chromosome complement of somatic cells. Tell me something about variation, if you have a sibling (if you don't imagine you do) - how is your sibling's genetic make-up similar and/or different from yours? What about your mom and dad?

2). Explain the terms reductional division and equational division. What is reduced or kept equal? To which nuclear divisions do these terms refer?

3). What is the diploid number (2n = ?) of an organism if it has
a) 12 chromosomes at Anaphase of Mitosis?
b) 12 chromosomes at Anaphase I of Meiosis?
c) 12 chromosomes at Anaphase II of Meiosis?

4). Compare/contrast Metaphase I of Meiosis with Metaphase of Mitosis.

5). What are the two mechanisms of variation in Meiosis, and during which stage(s) does each occur?

6). Draw a diagram of a bivalent and label the following parts: centromere, sister chromatids, non-sister chromatids, homologous chromosomes, chiasma.

7). A diploid cell has 1 pair of acrocentric chromosomes (Chromosome 1) and 1 pair of submetacentric chromosomes (Chromosome 2).
Â· Gene X is on Chromosome 1. Gene Y is on the short arm of Chromosome 2 and Gene Z is on the long arm of Chromosome 2.
Â· The maternal chromosomes have the X, y, z alleles, whereas the paternal chromosomes have the x, Y, Z alleles.
Draw these chromosomes, labeling ALL alleles, as they might appear in Metaphase I of Meiosis.

1. You want to determine the linear order and genetic distance between three genes on chromosome II in Drosophila. The recessive mutant alleles are g, m, and o. You cross heterozygous females to homozygous recessive males, score the phenotypes of progeny and obtain the following:

540 g m +

560 + + o

162 + m +

170 g + o

245 g + +

240 + m o

46 g m o

37 + + +

a) Determine the orientation of mutant vs. wild type alleles on the female parentâs chromosomes and then determine the gene order.

b) Calculate the distance between the three genes and draw the genetic map.

d) Calculate interference and provide a brief verbal interpretation of your result.

BIOL3044 Lecture Notes - Lecture 32: Helianthus Petiolaris, Helianthus Annuus, Quantitative Trait Locus

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