Zoology Principles of Inheritance and Variation questions from NEET UG 2016.
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the ${F}_{1}$ plants were selfed the resulting genotypes were in the ratio
A true breeding plant is:
If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is
In a testcross involving F$_{1}$ dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
Match the terms in Column-I with their description in Column-II and choose the correct option: <table class="pyq-table"><tbody><tr><td>Column - I</td><td>Column - II</td></tr><tr><td>(a) Dominance</td><td>(i) Many genes govern a single character</td></tr><tr><td>(b) Codominance</td><td>(ii) In a heterozygous organism, only one allele expresses itself</td></tr><tr><td>(c) Pleiotropy</td><td>(iii) In a heterozygous organism, both alleles express themselves fully</td></tr><tr><td>(d) Polygenic inheritance</td><td>(iv) A single gene influences many characters</td></tr></tbody></table>
Pick out the correct statements: (i) Haemophilia is a sex-linked recessive disease. (ii) Down's syndrome is due to aneuploidy. (iii) Phenylketonuria is an autosomal recessive gene disorder. (iv) Sickle cell anaemia is an X-linked recessive gene disorder.
The mechanism that causes a gene to move from one linkage group to another is called:
Which of the following most appropriately describes haemophilia?