Looking for classes? Ksquare Career Institute, Bengaluru →
Biology
Principles of Inheritance and Variation
198 questions from 38 papers, each with its answer.
- 198 questions
- 38 papers
- 5.62% of Biology
Test Cross
-
In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?To find whether a black-seeded plant is BB or Bb, a test cross is performed with the homozygous recessive (bb) plant. If all offspring are black, the plant is BB; if half are black and half white, it is Bb.
Incomplete Dominance in Snapdragon
-
A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?Flower colour in snapdragon shows incomplete dominance: RR = red, Rr = pink, rr = white. Pink (Rr) × Red (RR) gives RR (red) and Rr (pink) in a 1 : 1 ratio. So both red flowered and pink flowered plants are expected.
Genetics Terminology (Allele, Test Cross, Back Cross, Ploidy)
-
Match List I with List II regarding genetics terminology.
Pick the matching item from Column II for each row.
Column I
- A. Two or more alternative forms of a gene
- B. Cross of F1 progeny with homozygous recessive parent
- C. Cross of F1 progeny with any of the parents
- D. Number of chromosome sets in plant
Column II
- I. Back cross
- II. Ploidy
- III. Allele
- IV. Test cross
Correct answer: A → III, B → IV, C → I, D → II
Two or more alternative forms of a gene – allele Cross of $F_1$ progeny with homozygous recessive parent – test cross Cross of $F_1$ progeny with any of the parents – back cross Number of chromosome sets in a plant – ploidy Correct match: A-III, B-IV, C-I, D-II.
Mendel's Law of Dominance
-
Which one of the following can be explained on the basis of Mendel's Law of Dominance? A. Out of one pair of factors one is dominant and the other is recessive. B. Alleles do not show any expression and both the characters appear as such in F2 generation. C. Factors occur in pair in normal diploid plants. D. The discrete unit controlling a particular character is called factor. E. The expression of only one of the parental characters is found in a monohybrid cross. Choose the correct answer from the options given below:The Law of Dominance explains that characters are controlled by discrete units called factors (D), that factors occur in pairs in normal diploid plants (C), that of a pair of dissimilar factors one is dominant and the other recessive (A), and that only one of the parental characters is expressed in a monohybrid cross (E). Statement B is not explained by the law of dominance. So A, C, D and E only are correct.
Chromosomal Basis of Genetic Disorders
-
Match List-I with List-II regarding genetic disorders and the chromosome involved.
Pick the matching item from Column II for each row.
Column I
- A. Down's syndrome
- B. $\alpha$-Thalassemia
- C. $\beta$-Thalassemia
- D. Klinefelter's
Column II
- I. 11th chromosome
- II. 'X' chromosome
- III. 21st chromosome
- IV. 16th chromosome
Correct answer: A → III, B → IV, C → I, D → II
Down's syndrome – additional copy of chromosome 21 (trisomy 21) $\alpha$-Thalassemia – controlled by two closely linked genes HBA1 and HBA2 on chromosome 16 $\beta$-Thalassemia – controlled by a single gene HBB on chromosome 11 Klinefelter's syndrome – additional copy of the X chromosome (47, XXY) Correct match: A-III, B-IV, C-I, D-II.
ABO Blood Group Genetics (Multiple Alleles)
-
As per ABO blood grouping system, the blood group of fathers is $B^+$, mother is $A^+$ and child is $O^+$. Their respective genotype can be A. $I^Bi/I^Ai/ii$ B. $I^BI^B/I^AI^A/ii$ C. $I^AI^B/iI^A/I^Bi$ D. $I^Ai/I^Bi/I^Ai$ E. $iI^B/iI^A/I^AI^B$ Choose the most appropriate answer from the options given below:For an $O^+$ child (genotype ii), each parent must carry the recessive allele i. Father with blood group $B^+$ must be $I^Bi$, and mother with blood group $A^+$ must be $I^Ai$; child is ii. So only combination A ($I^Bi / I^Ai / ii$) is possible.
That is every question in Principles of Inheritance and Variation for this filter.
Want a score?
Answers here are not saved. Practise as a test to be marked and see your progress.
Practise as a test