Michael Jardine
Quiz by , created more than 1 year ago

I got 70%

59
0
0
Michael Jardine
Created by Michael Jardine almost 6 years ago
Close

GEGE2001 Quiz 1

Question 1 of 10

1

In a pedigree, autosomal recessive inheritance for a rare trait is characterised by the following:

Select one of the following:

  • Many more males than remales having the trait

  • Males with the trait always having daughters with the trait

  • Offspring of two parents with the trait have the trait

  • Two of the other answers

  • Often appearing with mating between relatives without the trait

Explanation

Question 2 of 10

1

A test cross refers to a:

Select one of the following:

  • None of the other answers

  • Reciprocal intercross among the F1 individuals

  • Reciprocal cross of the F1 to either parent

  • Backcross to the dominant parent

  • Cross where one of the parents is homozygous recessive

Explanation

Question 3 of 10

1

A cross between two different pure-breeding breeds of “coloured wing parrots” (red wing x white wing) gave the following progenies in the F1 and F2 generations: F1 = all pink; F2 = ¼ red, ½ pink, ¼ white. These results indicate that:

Select one of the following:

  • Pink is dominant over red and white

  • Red is dominant to white

  • Red is controlled by a different gene than white

  • Red is dominant to pink and white

  • None of the other answers

Explanation

Question 4 of 10

1

The principle of independent assortment means that:

Select one of the following:

  • There will always be a 3:1 ratio in the F2

  • Two of the other answers

  • There can be a 1:1:1:1 ratio in the testcross of a double heterozygote

  • The two alleles of a gene in heterozygotes separate into the gametes giving a 1:1 ratio in the gametes

  • It will occur during both cell division and gamete formation

Explanation

Question 5 of 10

1

If a χ2 (chi-square) test of a genetic ratio gives a Probability of 0.02 (2%), then:

Select one of the following:

  • You would be 98% sure that the results are correct

  • Two of the other answers

  • Enables the deletion of 2% of the observed numbers on each class which do not fit the expected ratio

  • You should reject the genetic hypothesis tested (if using the 5% significance level)

  • The difference between the observed and expected numbers is not big enough to say the observed numbers do not fit the tested ratio

Explanation

Question 6 of 10

1

Dominance is the determination of the phenotype by:

Select one of the following:

  • Multiple alleles

  • The interaction of the different alleles of a gene

  • None of the other answers

  • The interaction between the genotypes of two or more gene loci in determining the phenotype

  • Gene expression at a homozygous locus

Explanation

Question 7 of 10

1

Complete linkage means that:

Select one of the following:

  • The recombination fraction is 100%

  • Two of the other answers

  • There is no effect of dominance

  • Recombinants are not present

  • The recombination fraction is 50%

Explanation

Question 8 of 10

1

From a cross of sheep (Rr female parent, rr male parent), the progeny will be of genotype:

Select one of the following:

  • ½ Rr; ½ rr

  • RR, Rr, or rr

  • All rr

  • None of the other answers

  • All Rr

Explanation

Question 9 of 10

1

A cross is made between two pure breeding cattle breeds, where one breed is resistant to a tick species due only to a dominant allele of a gene for resistance, and the other breed is resistant only due to a recessive allele at a different gene to the first for resistance. Both genes are autosomal. The F1 between the breeds was resistant; what is the expected ratio of resistant to susceptible cattle in the F2 generation assuming independent assortment of the two autosomal genes? (Hint:
once a cattle individual is resistant because of its genotype at one of the genes, having resistance determined by the other gene does not give increased resistance, i.e. there are only 2 phenotypes: resistant and susceptible)

Select one of the following:

  • 13 resistant : 3 susceptible

  • 12 resistant : 4 susceptible

  • 15 resistant : 1 susceptible

  • 9 resistant : 7 susceptible

  • All susceptible

Explanation

Question 10 of 10

1

Repulsion double heterozygotes:

Select one of the following:

  • Come from the cross AAbb x aaBB

  • Give a higher frequency of recombinants than the coupling double heterozygotes

  • Never have independent assortment of the two genes

  • None of the other answers

  • Come from the cross AABB x aabb

Explanation

Previous
Next