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MBG 2040 / MBG2040 QUIZ 4 ANSWERS

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  • MBG 2040 / MBG2040
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  • University Of Guelph (U Of G )

MBG 2040 / MBG2040 QUIZ 4 ANSWERS Question 1 The process in which chromosomes exchange material through the breakage and reunion of their DNA molecules is called: Crossing Over Gene linkage Replication Assortment Question 2 In regards to linked genes, a dihybrid genotype can occur in two co...

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  • February 23, 2022
  • 18
  • 2021/2022
  • Exam (elaborations)
  • Questions & answers

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  • mbg 2040 mbg2040 quiz 4 answers

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  • University of Guelph (U of G )
  • MBG 2040 / MBG2040
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MBG 2040 / MBG2040 QUIZ 4 ANSWERS
Question 1
The process in which chromosomes exchange material through the
breakage and reunion of their DNA molecules is called:

Crossing Over


Gene linkage


Replication


Assortment

Question 2
In regards to linked genes, a dihybrid genotype can occur in two
configurations cis and trans, however the configuration of the alleles
has no impact on the gametes produced by the dihybrid individual.

False


True

Question 3
The genes for red hair and freckles both exhibit typical dominant-recessive patterns
however these traits tend to be inherited together. This is likely due to:

A family history of red hair and freckles

Linked Genes

Independent Assortment


Recombination

Question 4
While studying two traits in flowers petal colour and leaf shape you
notice that while both traits exhibit clear dominance patterns (blue
petal > white petals, heart shaped leafs > oval leafs) the 2nd
generation progeny of a dihybrid cross does not display the typical
9:3:3:1 phenotypic ratios that you would expect. It appears as though

, progeny are much more likely to exhibit one of the parental
phenotypes. This is likely due to:

Gene linkage


Recombination


Independent assortment


Cross-over

Gamete Production
Question 5
In a rare variety of orchid pink flowers (P) are dominant over green
and the presence of black spots (S) is dominant over no spots. These
two genes responsible for petal colouring are both located on
Chromosome 2. Two pink spotted plants are crossed and the
phenotypes of the F1 plants are recorded as follows:
Pink, spotted: 144
Pink, un-spotted: 9
Green, spotted: 7
Green, un-spotted: 37
What are the genotypes of the P generation?


Ps//pS x Ps//pS

PS//PS x PS//ps


pS//Ps x PS//ps

PS//ps x PS//ps

Gamete frequency
Question 6
In Drosophila two recessive mutations, rose wings (rs) and curled
wings (cu), are located 17 cM apart on chromosome 3. What gametes
and at what frequency would be produced by a fly with the following
genotype RScu//RSCU?

, RScu 83%; RSCU 17%

RScu 41.5%; RSCU 41.5%; rscu 8.5% ; rsCU 8.5%


RScu 41.5% ; RSCU 41.5% ; RSRS 8.5% ; CUcu 8.5%

RScu 50%; RSCU 50%


RScu 17% ; RSCU 83%

Question 7
In tomato plants the genes for hairless (hl) and leafy (lf) are located 6
cM apart on chromosome 5. What gametes and at what frequency
would be produced by a self-pollinated plant with the following
genotype HLLF//hlLF?

HLLF 47%; hlLF 47%; HLlf 3%; hlLF 3%


HLLF 6%; hlLF 6%; HLlf 47%; hlLF 47%

HLLF 47%; hlLF 47%; HLLF 6%; hlLF 6%

HLLF 50%; hlLF 50%


HLLF 47%; hllf 47%; HLlf 3%; lfLF 3%

Math 1
Question 8
In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a
spotted coat. These two genes T and S are located on the same chromosome, 39 map units
apart. One particular mouse has a short tail and a solid coat with the following genotype
TS//ts. What proportion (%) of this mouse’s gametes will be Ts? (One decimal place)
Your Answer:

(19.5)
Math 2
Question 9
In mice short tails (T) are dominant over long and a solid (S) coat is dominant over a
spotted coat. These two genes T and S are located on the same chromosome, 36 map units

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