A haemophilic man (XʰY) marries a woman who is homozygous normal (XᴴXᴴ). What will their children be?
Correct answer D. All daughters carriers and all sons normal
Topic / 48 questions
Inheritance MCQs
Page 2 of Inheritance multiple-choice questions with answers. Tap an option to check yourself.
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- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
A colour-blind man marries a carrier woman. What is the probability that a daughter of theirs is colour blind?
Correct answer B. 1/2
Criss-cross inheritance of an X-linked recessive trait means that the trait passes from ____.
Correct answer A. an affected father through his carrier daughter to his grandson
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A trait controlled by a gene found only on the Y chromosome will be passed ____.
Correct answer B. from a father to all of his sons
When pink-flowered four o’clock plants (Rr) are crossed among themselves, the F₂ phenotypic ratio is ____.
Correct answer A. 1 red : 2 pink : 1 white
In the four o’clock plant, red (RR) crossed with white (rr) gives pink F₁. This is an example of ____.
Correct answer D. incomplete dominance
In the cross AaBb × Aabb with complete dominance, what fraction of offspring shows both dominant phenotypes?
Correct answer A. 3/8
How many pairs of contrasting characters of the pea plant did Mendel study?
Correct answer A. Seven
Gregor Mendel carried out his breeding experiments on ____.
Correct answer A. the garden pea, Pisum sativum
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According to the law of segregation, the two alleles of a gene ____.
Correct answer A. separate so that each gamete receives only one allele
The physical basis of Mendel’s law of segregation is the separation of ____.
Correct answer C. homologous chromosomes during anaphase I of meiosis
Independent assortment of two genes on different chromosomes results from ____.
Correct answer D. the random orientation of homologous pairs at metaphase I
In Mendel’s F₂ generation of a monohybrid cross, the phenotypic ratio was ____.
Correct answer B. 3 : 1
What is the genotypic ratio in the F₂ of a monohybrid cross with complete dominance?
Correct answer A. 1 : 2 : 1
Mendel’s law of dominance states that ____.
Correct answer A. in a heterozygote one allele masks the expression of the other
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Alternative forms of the same gene found at the same locus on homologous chromosomes are called ____.
Correct answer A. alleles
A test cross is made between an individual showing the dominant phenotype and ____.
Correct answer D. a homozygous recessive individual
In a dihybrid cross between two plants heterozygous for both genes (AaBb × AaBb), the expected phenotypic ratio is ____.
Correct answer B. 9 : 3 : 3 : 1
A dihybrid test cross AaBb × aabb with unlinked genes produces offspring in the ratio ____.
Correct answer D. 1 : 1 : 1 : 1
In the cross AaBb × AaBb, what fraction of the offspring is expected to be aabb?
Correct answer A. 1/16