HMB265H1 Lecture : Notes taken during lecture

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redtermite204

8 Feb 2011

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Lecture sense of format and practise for the midterm the old midterms. aabb parent had two chromosomes: ab, ab. and in aabb, ab and ab are the two chromosomes. In f1 of linkage, it"s configuration will be ab chromosome and an ab chromosome. parents were double homozygous, recombination would not thus have any difference to the progeny without recombination. mostly f1 will make parental gametes, which are ab and ab: but with recombination in f1: ab and ab are the recombinant gametes. unlike how under mendelian ratios, the ratios are equal. can infer order of genes along chromosomes if look at many phenotypes and many crosses. If morgan is right, a+b+c = roughly a+c. ct and cv should have low proportion of recombinant phenotypes. Two inbred lines: test cross with vermilion eyes and cut wing edges, progeny produced. capitals for the pluses, lowercase for the non-

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Which statement correctly describes the relationship between the two copies of chromosome 14 in your own somatic cells and the two copies of chromosome 14 that are present in the somatic cells of your parents?AnswerEach of my chromosome 14s is a combination of the chromosome 14s that are present in my mother and my father.My chromosome 14s are unlike either of my parents.One of my chromosome 14s is a combination of the two chromosome 14s that are present in my mother's somatic cells. My other chromosome 14 is a combination of the two chromosome 14s that are present in my father's somatic cells.One of my chromosome 14s is exactly alike to one of the chromosomes in the somatic cells of my mother. My other chromosome 14 is exactly alike to one of the chromosomes in the somatic cells of my father.

taupeweasel583

4. Imagine you cross a plant homozygous for the recessive trait hairless leaves (h) with a plant homozygous for the recessive trait glossy stems (g). Wild-type plants have fuzzy (H) leaves and waxy (G) stems. Mapping studies have indicated that the two genes are linked.

What are the genotypes of the parental and recombinant gametes produced by the resulting F1 plant?

Parental Gametes: _______hh_____ and ______gg______; Recombinant Gametes: _____hg_______ and ______gh_______.

If these two genes are very close to each other on the chromosome:

Which of the four phenotypic classes of selfed progeny from the F1 plant will likely be absent in the F2 generation?

_________________________

What phenotype classes of progeny will be most common if the F1 plant is crossed with a hairless, glossy plant?

______________________________ and ______________________________

pucearmadillo175

My textbook says that the average length of a human chromosome is 140 cM (centimorgans). But how is it possible? I mean, since a frequency of recombination of 1 % indicates that two genes are separated by a distance of 1 cM, if we consider a gene in the 3' extremity of a chromosome and another gene in the 5' extremity of the same chromosome, their frequency of recombination should be 140%! What am I doing wrong?

HMB265H1 Lecture : Notes taken during lecture

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