Frank solutions for Biology [English] Class 10 ICSE chapter 3 - Principles of Genetics [Latest edition]

Define the following:

Genotype

Define the following:

Phenotype

Define the following:

Homozygous

Define the following:

Heterozygous

Define the following:

Allele

Define the following:

Dominant

Define the following:

Recessive

Predict the genotype and phenotype of the following cross in pea.

TT x Tt

(Capital letters show dominance)

Predict the genotype and phenotype of the following cross in pea.

tt x TT

(Capital letters show dominance)

Predict the genotype and phenotype of the following cross in pea.

TTrr x ttRR

(Capital letters show dominance)

Predict the genotype and phenotype of the following cross in pea.

TtRr x TtRr

(Capital letters show dominance)

Give the ratio of phenotype of these crosses.

Mention whether the cross is a monohybrid or dihybrid.

Define the following:
Autosomes

Define the following:
Sex chromosomes

Define the following:
Sex-linked characters

A woman has normal vision but her father was colour blind. If she is married to a colour blind person, report on the occurrence of the disease in the progeny.

Suppose you are given two pairs of contrasting characters: Seed colour → yellow and green , seed coat → round and wrinkled.

Fill in the following table to show that F₂ generation according to the principle of independant assortment as given by Mendel.

State Mendel's law of dominance.

Answer the following briefly:

Explain with the help of a chart what will be the colour of a child's hair if father has got dominant gene for black hair and mother has recessive gene for brown hair?

Explain the following terms:

Laws of Inheritance

Explain the following terms:

Identical twins

Define the term heredity.

A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness . 

(i) Who is colour blind in parents - Father or Mother?
(ii) How many daughters and sons have beeen born in the family?
(iii) What does the child 1 indicate about this trait?
(iv) Complete the depiction of all probabilities of the trait among the children 2-5 in the chart.
(v) On which chromosome is the gene of this trait located?
(vi) Name one other trait in humans which follows the similar mode of inheritance.

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Mendel conducted his hybridization experiments on _______

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If a homozygous tall plant is crossed with a heterozygous tall plant, the proportion of tall progeny would be ____________

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Mendel used ______ pairs of a characters for his experiments.

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Father of genetics ________

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The allele which masks the effect of its complement is _______

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If any of Mendel's characters were linked; one would have been unable to derive.

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The contrasting characters used by Mendel are called _____

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If a pea plant with round seeds is selfed and the offspring are in the ratio 3:1, then the plant is _________

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A cross where two pairs of alleles are considered is a ____________

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Mendel was born in __________

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Human sex chromosomes are __________

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Haemophilia is due to recessive gene on __________

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Chromosomes identical in male and female are called __________

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Males have more chances of suffering from sex-linked disease because of ___________

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A single recessive trait, able to express must be on _________

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A carrier haemophilic woman marries a haemophilic man. What are the chances for her progeny to be haemophilic?

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 A colour blind woman marries a normal man, in the progeny _________

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A man can transfer his sex-linked gene to his ______________