Q. No.What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
(1) There is considerable genetic variation in garden peas.
(2) Traits are inherited in discrete units, and are not the results of ʺblending.ʺ
(3) Genes are composed of DNA.
(4) An organism that is homozygous for many recessive traits is at a disadvantage.
(1) There is considerable genetic variation in garden peas.
(2) Traits are inherited in discrete units, and are not the results of ʺblending.ʺ
(3) Genes are composed of DNA.
(4) An organism that is homozygous for many recessive traits is at a disadvantage.
An organism with two copies of the same allele is:
(1) Homozygous for that trait
(2) Homologous for the allele
(3) Heterozygous for that trait
(4) Heterologous for the allele
Which of the following about the law of segregation is true?
(1) It states that each of two alleles for a given trait segregate into same gametes.
(2) It can be explained by the segregation of heterologous chromosomes during meiosis.
(3) It can account for the 3:1 ratio seen in the F2 generation of Mendelʹs crosses.
(4) It is a method that can be used to determine the number of chromosomes in a plant.
In guinea pigs, black coat color is a dominant trait and white is a recessive trait. When heterozygous black pigs are intercrossed the chance of the first two offspring being black is:
(1) 75 %
(2) 56 %
(3) 44 %
(4) 6 %
The minimum progeny population size allowing for random union of all kinds of gametes from AaBbCc parents is:
(1) 9
(2) 16
(3) 27
(4) 64
How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
(1) 4
(2) 8
(3) 16
(4) 32
Two heterozygous round yellow seeded pea plants are intercrossed. In the progeny, the trait for seed shape will segregate in the ratio:
(1) 1 : 1
(2) 3 : 1
(3) 1 : 1 : 1 : 1
(4) 9 : 3 : 3 : 1
Given the parents AABBCc × AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?
(1) 1/4
(2) 1/8
(3) 3/4
(4) 3/8
In a cross between AABB X aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be:
(1) 9 : 3 : 3 : 1
(2) 2 : 1 : 1 : 2
(3) 1 : 2 : 2 : 1
(4) 7 : 5 : 3 : 1
Which of the following terms best describes when the phenotype of the heterozygote differs from the phenotypes of both homozygotes?
(1) Incomplete dominance
(2) Multiple alleles
(3) Codominance
(4) Epistasis
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