New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here


by: Elaina Gorczany


Elaina Gorczany
GPA 3.6

Kenneth Quesenberry

Almost Ready


These notes were just uploaded, and will be ready to view shortly.

Purchase these notes here, or revisit this page.

Either way, we'll remind you when they're ready :)

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Kenneth Quesenberry
Class Notes
25 ?




Popular in Course

Popular in Agricultural & Resource Econ

This 3 page Class Notes was uploaded by Elaina Gorczany on Friday September 18, 2015. The Class Notes belongs to AGR 6353 at University of Florida taught by Kenneth Quesenberry in Fall. Since its upload, it has received 16 views. For similar materials see /class/206615/agr-6353-university-of-florida in Agricultural & Resource Econ at University of Florida.

Similar to AGR 6353 at UF

Popular in Agricultural & Resource Econ




Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/18/15
XII 2n Gametes AGR 6353 Cytogenetics Fall 2007 K H Quesenberry A Introduction 1 First reported by Gates 1909 in Oenothera 2 Two basic types of Zn gamete formation a First Division Restitution FDR Incomplete 1st meiotic division FDR 2ngametes comprise the nonsister chromatids of each homologous pair of chromosomes and are genetically identical to parent b Second Div ion Restit on SDR Incomplete 2nd meiotic diVIsion SDR 2n ametes include the sister chromatids Spores are completely homozygous but genetically different B Schematic representation comparing meiosis in cells with normal and parallel orientation of second 39 I n spindles Propnasel gt lnterpnasel Parallel Spindles Normal 3332233 Meiotic Q Products A M 2 In a normal meiosis the Al spindle fiber orientation is quotperpendicularquot to the All spindle fiber orientation 3 thn parallel spindles both Aland All spindles are in the same direction zen spines 17 2n spare C Comparison of results from normal meiosis incomplete first FDR orincomplete second d on restitution SDR ofmeiosls l i I x H i i i 1 2 39 gt gt I 2 2 2 2 2 2 2 M A M II Tetrad Normal Meiosis C Comparison of results from normal meiosis incomplete first FDR or incomplete second diVIsion restitution SDR sis 2 of melo 1 H l 1 11 2 39 a n 2 2 W H 22 M A M II Dyad Incomplete First Division quotFirst Division Restitutionquot C Comparison of results from normal meiosis incomplete first FDR orincomplete second diVIsion restitution SDR 39 sis 3 of melo 1 II 1 1 11 12 2 2 l1 2 V 22 Ml Al Mll Dyad Incomplete Second Division quotSecond Division Restitutionquot D Genetic Consequences of FDR Assuming One Crossover per Pair of Homologous Chromosomes 1 A jAHa Aa a A a a AHE aHA Crossover between locus and centromere 50 horn 01 50 heteroz D Genetic Consequences of FDR Assuming One Crossover per Pair of Homologous Chromosomes 2 BuB E 3 4 be b No crossoverbetween locus and centromere 100 Heterozygous also all genes on short arm 3b Bb represents all heterozygous loci affected by the crossover those not affected by the crossover E Genetic Consequences of SDR Assuming One Crossover per Pair of Homologous Chromosomes 1 AHa la a ilt AHa Aa Aa unlgtgt Crossover between AH a locus and centromere a A 100 Heterozygosity E Genetic Consequences of SDR Assuming One Crossover per Pair of Homologous Chromosomes 2 B a B B B B 2 I B b I L a b b b b b No crossover between locus and centromere 0 oHomozygous 55 bb also all genes on short arm represents all heterozygous loci affected by the crossover those not affected by the crossover F Summary FDR vs SDR Gametes 1 1 First Division Restitution a Transfer average of 80 of parental heterozygosity to progeny b Therefore heterozygous parents produce heterogametes w ich lead to multiallelic loci and high vigor in autotetraploid progeny c Gametes are largely genetically to parent and thus progeny are very uniform F Summary FDR vs SDR Gametes 2 2 Second a Have a relatively high level of homozygosity maybe up to 80 from parent which is 50 homozygous This may increase dosage of alleles for certain desirable simply inherited dominant characters c Gametes from heterozygous parent are heterogeneous Therefore progeny are heterogeneous and potential for progeny selection increases Equot w Semiheterotypic d39 G General Mechanism of Zn Gamete Formation 1 Premeiotic doubling with autobivalent formatio n Allium Chromo ouble in early prophase and sister chromatids stick together Homologs do not pair FDR Mitotized meiosis d n of chromosomes in EMC similar to mitosis 2n megaspores Ex Poa spp n chromosomes of EMC hardly or do not pair Univa ents at Ml are irregularly distributed Followed by 2nd division resulting in 2n amete G General Mechanism of Zn Gamete Formation 2 4 Pseudohomotypic div n chromosomes of EMC do Io not pair Univalents dIVIde equationally at Ml Gametes are to FDR 2n gametes Ex Solanum 5 Synaptic mutants interspecific hybrid etc 6 Genetic control pc1 and pc 2 SDR potato ps potato rp alfalfa FDR pc premature cytokynesis ps parallel spindles rp round poHenL


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Anthony Lee UC Santa Barbara

"I bought an awesome study guide, which helped me get an A in my Math 34B class this quarter!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.