Sets 8

Question 1

what is genetically linked ?

Answer 1

when in close proximity to one another on the chromosome they are likely to assort together

Question 1

What does 1:1:1:1 ratio mean ?

Answer 1

that two genes are on the same chromsomes; they are linked its independant assostment

Question 2

when parental combinations out number recombinant types what does it mean ?

Answer 2

the genes are linked

Question 3

what are recombinant phenotypes and how do they arise ?

Answer 3

there the phenotype that are not the same of the parents they come from the recombination of non-sister chromsomes during meiosis I

Question 4

what does recombination frequency depend on ?

Answer 4

the gene pair itself

Question 5

when the recombination % is low what does it mean ?

Answer 5

the genes are close

Question 6

What is recomb frequency units?

Answer 6

1 centi morgan= 1 map unit ex recomb freq 38.5 % = 38.5 m.u =38.5 cM

Question 7

what does a 50% recomb frequency mean ?

Answer 7

they are not on the same chromosomes or at a great distance on the chromosomes

Question 8

when its unlinked can it still be on the same chromosome?

Answer 8

yes

Question 9

can linkage be 100%?

Answer 9

no

Question 10

what is the chi square test ?

Answer 10

a stats test used to evaluate hypotheses that if two genes assort independently or genetically linked.

Question 11

what is null hypothesis and what does it mean ?

Answer 11

patterns we see due to chance and the genes are no linked

Question 12

what is the p-value ?

Answer 12

the probability of an outcome due to chance alone

Question 13

when given a male progeny (F2 GEN) of an F1 female cross how will you figure out the F1 female ?

Answer 13

by looking at the parent genotype

Question 14

when given a male progeny (F2 GEN) of an F1 female cross how will you figure out the male

Answer 14

as the male only provides Y in this case his genotype can be anything

Question 15

when given a female progeny (F2 GEN) of an F1 female cross how will you figure out the male

Answer 15

by looking at the parental

Question 16

The following data is from a testcross with a heterozygous female. What is the expected number in group y+ z+ if we assume no linkage?

                            y+ z    471

                            y+ z+    69

                            y  z+   482

                            y  z      76

549

1098

145

274.5

Answer 16

274.5 bc 4 groups would assort independalty

Question 17

what does a p value less than 0.05 mean (5%) ?

Answer 17

that its unlikely

Question 18

what does a p value more than 0.05 mean ? (5%)

Answer 18

very likely

Question 19

how to calculate chi sqaure ?

Answer 19

(observed PARENTAL- expected P) ^2 / expected p + (OBSERVED R - expected R)^2/expected R

Question 20

dont forgot degrees of freedom ( class : parent / recomb ) = 2 (n) -1 =1