Question 2 :
In male grasshoppers and moths, there are two pairs of autosomes and
Question 3 :
As per Lyon's hypothesis, one of the two X chromosomes undergoes heterochromatisation and is called as
Question 4 :
According to the chromosomal theory of inheritance, the hereditary unit which occurs in pair is known as
Question 7 :
The total number of chromosomes in an organism with haploid number of 18 would be<br/>
Question 12 :
Which one of the following conditions of the zygotic cell will produce a normal human female child?
Question 16 :
Balanced theory of sex determine is related to which of the following?
Question 22 : <div>With reference to sex determination in Melandrium album, consider the following statements.</div><div>a. The Y chromosome is longer than the X chromosome.</div><div>b. The Y chromosome and X chromosome form a heteromorphic bivalent at meiosis.</div><div>c. It is the presence of a single Y chromosome rather than any number of X chromosomes or autosomes that give a male individual.</div><div>Which of the statements give are correct?</div>
Question 23 :
<span>What was the most significant conclusion that Mendel drew from his experiments?</span>
Question 29 :
Which of the following is an example of ZW-ZZ type of mechanism of sex determination?
Question 30 :
In our society women are blamed for producing a female child. Choose the correct answer for sex determination in humans due to
Question 31 :
If a couple has two boys and one girl, the probability of the next girl child to be born is
Question 33 :
<span>A normal metaphase chromosome with a middle centromere is<br><br> or<br><br></span>Chromosomes whose arms are equal are called
Question 36 : Choose the correct statement.<br/>A) Chromosomal theory of inheritance supports dominance.<br/>B) Chromosomes are the hereditary unit which exists with multiple characters known as an allele.<div>C) The Mendelian factor is located on the chromosomes.</div>
Question 38 :
Who suggested for the first time that genes are located on the chromosomes?
Question 39 :
A Drosophila has XXXYY sex chromosomes. All the autosomal chromosomes are normal. The sexual phenotype will be.
Question 43 :
Appearance of new combinations in $F_2$ generation in, a dihybrid cross proves the law of<br/>
Question 44 :
A couple has $8$ children, all boys. What is the chance that their ninth child will be another boy?
Question 45 :
Which one of the following discoveries provided the strongest evidence for the chromosome theory of heredity?
Question 47 :
In specific population of a species, individuals showing $2n+1$ or $2n-1$ set of chromosomes are called respectively.
Question 51 :
<i>Drosophila</i> flies with one half of the body male and other half female is referred to as<br/>
Question 52 :
Which one of the following correctly describes the manner of determining the sex in the given examples?
Question 53 :
In bugs and cockroaches (insects), the sex determinations takes place by
Question 57 : Choose the correct answer from the alternatives given.<div><br/>In XO type of sex determination</div>
Question 63 :
The theory of recombination of linked gene due to crossing <span>over of chromosome during zygotene of meiosis was put <span>forwarded by</span></span>
Question 64 :
What is the inheritance of colour blindness of both parents having a normal vision but mother having a recessive gene for colour blindness?
Question 66 :
Experimental verification of the chromosomal theory of inheritance was given by which of the following scientists?<br/>
Question 68 :
Eye colour in fruitfly is a sex linked trait and the cross of white eyed female with red eyed male gives red eyed females and white eyed males. Rarely this cross may give all white eyed females and red eyed males. This was found to be due to non-disjunction of
Question 70 :
Given are some organisms.<br>(I) Fowl (II) Humans (III) Grasshopper<br>Following alphabets related to the given animals.<br>Male homogametic - A<br>Female heterogametic -B<br>Male heterogametic - C<br>Female homogametic - D<br>Which of the following options correctly describes the given animals in terms of sex determination?<br>
Question 72 :
In $Drosophila$ formation of gynandromorph and their cytological explanation provide best evidence that
Question 73 :
Male XX and female XY sometime such conditions occur due to
Question 75 :
For <span>making<br><br>important contributions in respect of the nature of gene, the Noble </span><span>Prize was rewarded to </span>
Question 77 :
According to the chromosomal theory of inheritance, which of the following type of cell division contributes maximum for recombination and genetic variation?
Question 79 :
In what the study of XX-XO type method was done initially?
Question 83 :
Which of the following statement for chromosomal theory of inheritance is incorrect?
Question 84 :
In polytene chromosomes dark bands are visible.<br><br>These bands are formed by the apposition of
Question 85 :
Which of the following condition occurs in the person with genotype XO?
Question 86 :
In which group of organism, the male has one less chromosome than female?
Question 87 :
In a population of families having three children each, the percentage of population of families having both boys and girls is?
