BIOL 1364 University of The West Indies St Augustine Campus Biology Question

User Generated

QbaFrnyl

Science

BIOL 1364

University of the West Indies

BIOL

Description

SEE ATTACHED DCOUMENT FOR QUESTIONS

You have TWO (2) hours to answer this multipart question in full.

Unformatted Attachment Preview

THE UNIVERSITY OF THE WEST INDIES ST. AUGUSTINE CAMPUS DEPARTMENT OF LIFE SCIENCES BIOL1364- FINAL TAKE-HOME ASSIGNMENT INSTRUCTIONS: This paper has TWO pages. Answer all questions and upload your responses onto myelearning during the 3-hour period of your assignment. 1. A snapdragon plant that bred true for white flowers (AABB) was crossed to a plant that bred true for red flowers (aabb). All individuals in the F1 generation had white flowers. The F2 generation had three phenotypic classes in the following numbers: Phenotype White Purple Red Total Number 240 61 19 320 a) What genetic phenomenon do the results suggest? (1 mark) b) Propose a genetic (8 marks) and biochemical (5 marks) explanation for the results. c) What is the expected phenotypic ratio in the testcross generation? (3 marks) TOTAL 17 MARKS 2. A cross was made between (ab+) and (++c) Ascomycetes with unordered tetrads. From the analysis of 1000 acsi given below, determine the genetic distances between the three loci (12 marks) and draw a genetic linkage map for the three genes (3 marks). Ascus type 1 2 3 4 Number 405 370 145 80 Genotypes (ab+) (ab+) (++c) (++c) (abc) (abc) (+++) (+++) (a++) (+++) (abc) (+bc) (++c) (++c) (ab+) (ab+) TOTAL 15 MARKS 3. For each pair of terms, DEFINE each term and provide THREE (3) DIFFERENCES between each pair. Present the differences for each pair in a table. a) nuclear autosomal inheritance vs. cytoplasmic inheritance. (5 marks) b) multiple allelism vs. polygenic traits. (5 marks) c) Mendelian inheritance vs. genetic linkage for a digenic cross (5 marks) TOTAL 15 MARKS 4. In a family with three children, what is the probability that two are boys and one is a girl? (4 marks) TOTAL 4 MARKS 5. a) DISTINGUISH clearly between sex-linked traits and sex-limited traits. (4 marks) b) Outline FIVE (5) characteristic features of sex-linked inheritance. (5 marks) TOTAL 9 MARKS GRAND TOTAL 60 MARKS we/WE Q & abe x ABC . 405 370 ലമാരിക്ക് മലC) മല 2) abc abo abc ABC ABC 3) ABC ABC abc nec abc abc) 80 l 프 10C < X N.P.OT TO Total gene a b ? ab o Parental 2) Parental 3) Tetrad 4) Parental o T / (145) x 100 1000 R.6% -7,25 mu blw ako P ac * AC e=ac& AC 145 + Y (H05 +80) Gene Are 1) Tetrad 3) Parential 3) N.P.D. 4) Tetraed X100 100D 1457 242.5=387.5" = 38.78 box BC (405480) + 1/2(0) B 2 c D.N.P.D 2) Parental 8) Parent 2) N.P.D. 1000 485 = 48.5 CM FOOD 7 ㅋ А 38.75 mee. B 7.25 12 의 48. Ś mee کی 3.a Features Inheritance of Genes Gene Nuclear autosomal inheritance Present in the chromosomes to the offspring Consist of chromosomes which contain DNA. It is located in the nucleus Follows Mendelian Inheritance Cytoplasmic inheritance Present in cytoplasmic organelles to offspring Cytoplasmic organelles such as the mitochondria consist of DNA Does not follow Mendelian Inheritance Mediated by maternal Mendelian Inheritance Mediation Mediated by maternal and parental Large number of genes No. of genes Small number of genes b) Features Definition Multiple alleles Series of 3 or more alternate genes In homologous chromosomes, it is located at the same loci Location Polygenic Traits A group of non allele genes which controls a trait In non-homologous chromosomes, it is located at different loci Shows variation of trait A single trait can be controlled by a large number of genes Variation Gene No variation of trait One gene has two or more alleles
Purchase answer to see full attachment
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

Attached. Please let me know if you have any questions or need revisions.

1. a) The genetic phenomenon suggested In the results is variation.
b) Genetic Explanation
Variation is a word used to describe the differences in genetic material in terms of DNA
sequencing within each genome in a species. Genetic variation is the phenomenon that separates
one species from the other in terms of phenotypic appearance and perception. The individual
entities within a single species have similar traits but are not identical. This difference is
explained to be brought about by variation. There are subtle differences in the DNA sequencing
which are primarily the causes of variation. Genetic variation leads to existence of different
alleles or forms of genes, and these determine the color of the different flower species. Genetic
variation occurs from genes inherite...


Anonymous
Really helpful material, saved me a great deal of time.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Related Tags