21
A gene pair hides the effect of another gene. The phenomenon is called
Answer: epistasis
Questions
23
When a single gene influences more than one trait it is called
Answer: pleiotrophy
24
If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different?
Answer: he would not have discovered the law of independent assortment
25
Crossing over in diploid organism is responsible for
Answer: recombination of linked alleles
26
How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype AABbCc?
Answer: four
27
A fruit fly is heterozygous for sex-linked genes, when mated with normal female fruit fly, the males specific chromosome will enter egg cell in the proportion
Answer: 1:1
29
When two dominant independently assorting genes react with each other, they are called
Answer: complementary genes
30
When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be
Answer: pseudoalleles
31
The phenomenon, in which an allele of one gene suppresses the activity of an allele of another gene, is known as
Answer: epistasis
32
Of both normal parents, the chance of a male child becoming colour blind are
Answer: possible only when mother’s father was colour blind.
33
Mr. Kapoor has Bb autosomal gene pair and d allele sex-linked. What shall be proportion of Bd in sperms?
Answer: 1/4
34
Which of the following is suitable for experiment on linkage?
Answer: AABB x aabb
35
Of a normal couple, half the sons are haemophiliac while half the daughters are carriers. The gene is located on
Answer: one X-chromosome of mother
36
Two dominant nonallelic genes are 50 map units apart. The linkage is
Answer: absent/incomplete
38
Mendel studied inheritance of seven pairs of traits in Pea which can have 21 possible combinations.
If you are told that in one of these combinations, independent assortment is not observed in later studies, your reaction will be
Answer: mendel might not have studied all the combinations
39
A child of O-group has B-group father. The genotype of father will be
Answer: IBI°
40
According to mendelism which character shows dominance?
Answer: green pod colour
