Structured/Skill Type Ans on Genetics: Some Basic Fundamentals ICSE Class 10 Concise Biology Selina Solutions Ch-3. In this article you will get the solutions of Structured/Skill Type Ans with hint as council latest syllabus. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.

Structured/Skill Type Ans on Genetics: Some Basic Fundamentals ICSE Class 10 Concise Biology Selina Solutions Ch-3

Board	ICSE
Subject	Biology
Class	10
Book	Selina Concise
Chapter-3	Genetics: Some Basic Fundamentals
Topics	Solutions of Structured/Skill Type Ans

Structured/Skill Type Ans on Genetics:

( Some Basic Fundamentals ICSE Class 10 Concise Biology Selina Solutions Ch-3)

Page 35

Que-1: In a certain species of animals, black fur (B) is dominant over brown fur (b). Predict the genotype and phenotype of the offspring, when both parents are ‘Bb’ or have heterozygous black fur.

Ans:

Genotype – 1(Homozygous Black Fur) :2 (Heterozygous Black Fur):1 (Homozygous Brown Fur)
Phenotype – 3 (Black Fur) :1(Brown Fur)

Que-2: Two pairs (A & B) of rabbits were crossed as given below:

(a) Can you tell which coat colour (black or white) is dominant?
(b) Is the coat colour sex-linked?

Ans:
(a) Black
(b) No

Que-3: Make a Punnett square for finding out the proportion of different genotypes in the progeny of a genetic cross between

(a) A pure tall (TT) pea plant with a pure dwarf (tt) pea plant.
(b) Red flower variety of pea (RR) with white flower variety of pea (rr).

Ans:
(a)

Genotype – 1(Homozygous red) :2 (Heterozygous red):1 (Homozygous white)
Phenotype – 3 (Red) :1(White)

Que-4: Mendel crossed a homozygous pea plant having round seeds (RR) with a homozygous pea plant having wrinkled seeds (rr). He got different results. On the basis of it, answer the following questions:

(a) Which character of seed is studied in the experiment?
(b) Which of the above two traits is dominant ?
(c) Write the phenotype and genotype of F₁ offspring.
(d) Mention and state the Mendel’s law shown in the above cross.
(e) Make a Punnett square for F₂ generation when two plants of F₁ offspring are crossed with each other.
(f) Write the phenotypic ratio of F₂ progeny.
(g) What will be the genotypic ratio of F₂ offsprings ?
(h) What are the two traits of seed colour ? Also mention which is dominant and recessive ?
(i) Write the scientific name of garden pea.
(j) Write two main features of pea plant due to which Mendel had selected it for his hybridisation studies.

Ans:
(a) Shape of seed
(b) Round seed shape is dominant.
(c) Phenotype — Round seed
Genotype — Rr
(d) Law of dominance, which states that out of a pair of contrasting characters present together, only one is able to express itself while the other remains suppressed.
(e)

Gamete	R	r
R	RR	Rr
r	Rr	rr

(f) Phenotypic ratio — 3:1
(g) Genotypic ratio — 1:2:1
(h) The two traits of seed colour are:

1. Yellow (dominant)
2. Green (recessive)

(i) Pisum sativum

(j) The two main features due to which Mendel selected pea plants are :

1. Many varieties were available in alternative forms of a character.
2. The life span of pea plants is short and many generations can be obtained and studied in less time.

Que-5: A homozygous plant having round (R) and yellow (Y) seed is crossed with another homozygous plant having wrinkled (r) and green (y) seeds. Answer the following questions :

(a) Give the genotype of the F₁ generation.
(b) Mention the phenotype of the F₁ offsprings.
(c) Give the possible combinations of gametes that can be obtained from F₁ hybrids.
(d) Give the dihybrid phenotypic ratio and the phenotype of the offsprings of the F₂ generation when two plants of F₁ generation are crossed.
(e) Name and state the law which explains the dihybrid phenotypic ratio.

Ans:
(a) Genotype : RrYy
(b) All Round and yellow seeds
(c) RY, Ry, rY, ry
(d) 9:3:3:1
(e) Law of Independent Assortment, which states that the distribution of the alleles of one character into the gametes is independent of the distribution of the alleles of the other character.

–: End of Structured/Skill Type Ans on Genetics: Some Basic Fundamentals ICSE Class 10 Concise Biology Selina Solutions  :–

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