Question 2 :
Consider a gene that has two alleles and shows complete dominance. When two heterozygotes for this gene breed, they have a 25 percent chance of producing a homozygous recessive offspring. The next time they breed, what are the chances that they will once again have a homozygous recessive progeny?

Question 6 :
Haemophilia is a condition in which blood fails to clot only very slowly. Studies of this human sex-linked trait show that

Question 8 :
Which one of the following also acts as a catalyst in a bacterial cell?

Question 9 :
c-DNA probes are copied from the messenger RNA molecules with the help of

Question 12 :
Darwin in his "Natural Selection Theory" did not believe in any role of which one of the following in organic evolution{tex}?{/tex}

Question 15 :
<p>In law of independent assortment. How many factors are involved? (for a dihybrid cross)</p>

Question 16 :
Pea plants having seeds with yellow colour and Round shape (YYRR) were crossed with pea plants having seeds with green colour and Wrinkled shape (yyrr). Expected phenotypic ratio in {tex}\mathrm{F_1} {/tex} progeny:

Question 17 :
One of the possible early sources of energy was / were:

Question 18 :
<p>Which of the following statement is correct about <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ed09cf3034cc06301290dc2"/></p>

Question 21 :
In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and remaining 160 to aa. Based on this data, the frequency of all A in the population is

Question 26 :
A codon consists of three bases and there are four kinds of bases in a nucleic acid altogether. How many codons will be there?

Question 28 :
Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that:

Question 31 :
What base is responsible for hot spots for spontaneous point mutations?

Question 32 :
<p>Organic compounds first evolved in earth required for origin of life were</p>

Question 33 :
Given below are four statements (i - iv) each with one or two blanks. Select the option which correctly fills up the blanks in two out of four statements. <br>(i) Wings of butterfly and birds look alike and are the results of __(A)____, evolution. <br>(ii) Miller showed that CH4 , H2 , NH3 and ___(A)___, when exposed to electric discharge in a flask resulted in formation of ___(B)_____. <br>(iii) Vermiform appendix is a ___(A)____ organ and an __(B)_____ evidence of evolution. <br>(iv) According to Darwin, evolution took place due to ___(A)___ and ___(B)__ of the fittest.

Question 34 :
Match the column-I with column-II and choose the correct option. <table> <tbody> <tr> <td>Column-I</td> <td>Column-II</td> </tr> <tr> <td>A. Human embryos&nbsp;&nbsp;have gill</td> <td>I. Chemical evolution</td> </tr> <tr> <td>B. Oparin and Haldane</td> <td>II. Stimulation experiment&nbsp;</td> </tr> <tr> <td>C. Miller and Urey</td> <td>III. Wings of bird and butterfly</td> </tr> <tr> <td>D. Analogous organs phylogeny</td> <td>IV. Ontogeny repeats&nbsp;</td> </tr> </tbody> </table>

Question 35 :
Natural selection is sometimes described as "survival of the fittest". Which of the following most accurately measures an organism's fitness?

Question 36 :
Which of the following is not the characteristic feature of genetic code

Question 37 :
<p>Extranuclear inheritance is a consequence of presence of genes in </p>

Question 41 :
Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child{tex}?{/tex}

Question 42 :
Both C. Darwin and A. R. Wallace developed, independently of each other, the theory of evolution by natural selection. Yet Darwin is given credit for the theory because he

Question 43 :
Trisomy of chromosome number 21 is characterized by all of following except:

Question 44 :
Assertion : In humans, the gamete contributed by the male determines whether the child produced will be male or female.<br>Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on X-chromosome and some on Y-chromosome.

Question 45 :
Termination of protein synthesis needs <br>A. ^5'AUB3' codon <br>B. ^5'GUG³'<br>C. Stop signal / Non-sense codon <br>D. Release / termination factor

Question 46 :
<br /><br />Following diagram provides an example of<br /><img style='object-fit:contain' class="uploaded-image" src="https://storage.googleapis.com/teachmint/question_assets/NEET/5f34d9c327fc8235fb050ff9" />

Question 48 :
<p>Letter symbol refers to the dominant factors give a …A… or upper case latter of the alphabet. A corresponding …B… or lower case letter is used for recessive factor. Here A and B refers to</p>