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Chapter 16: Genetics Revision Questions

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Revision questions on genetics and inheritance for Leaving Cert Biology
John Loughlin
Quiz by John Loughlin, updated more than 1 year ago
John Loughlin
Created by John Loughlin almost 8 years ago
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Question 1

Question
Genetics is the study of:
Answer
  • The nucleus
  • RNA
  • DNA
  • Inheritance

Question 2

Question
Inheritance is:
Answer
  • The passing on of traits from one generation to the next.
  • The passing on of cells from one generation to the next.
  • The passing on of proteins from one generation to the next.
  • The passing on of ideas from one generation to the next.

Question 3

Question
A gamete is:
Answer
  • A diploid cell
  • A triploid cell
  • A haploid sex cell
  • A bacterial cell

Question 4

Question
Meiosis is important in sexual reproduction because it produces:
Answer
  • New cells
  • Sex cells
  • Diploid cells
  • Zygotes

Question 5

Question
In humans there are ___________ chromosomes in each sex cell.
Answer
  • 46
  • 23
  • 92
  • 22

Question 6

Question
Fertilisation is:
Answer
  • The fusion of two diploid cells to form a diploid zygote
  • The fusion of two haploid cells to form a diploid zygote
  • The fusion of a diploid cell and a haploid cell to form a diploid zygote
  • The fusion of two haploid cells to form a haploid zygote

Question 7

Question
An alternative form of a gene is known as:
Answer
  • An allele
  • A locus
  • A gentoype
  • A phenotype

Question 8

Question
A locus is:
Answer
  • The position of a chromosome in a cell
  • The position of a gene on a chromosome
  • The position of a protein on a chromosome
  • The position of a cell in the body

Question 9

Question
Which of the following terms correctly describes the situation when two alleles are identical?
Answer
  • Heterozygous
  • Dominance
  • Recessive
  • Homozygous

Question 10

Question
Which of the following terms correctly describes the situation when two alleles are different?
Answer
  • Homozygous
  • Heterozygous
  • Recessive
  • Dominance

Question 11

Question
Pure-breeding means the same as:
Answer
  • Homozygous
  • Heterozygous
  • Recessive
  • Dominance

Question 12

Question
Dominance in genetics refers to:
Answer
  • Where one allele has very little effect over another allele
  • Where one allele is as effective as another allele
  • Where one allele complements the effect of another allele
  • Where one allele masks the effect of another allele

Question 13

Question
Recessive in genetics refers to:
Answer
  • When an allele's effect is only expressed in the heterozygous condition
  • When an allele's effect is only expressed in the homozygous condition
  • When an allele's effect is never expressed
  • When an allele's effect is always expressed

Question 14

Question
Genotype of an individual refers to its:
Answer
  • Genetic make-up
  • Physical make-up
  • Physiological make-up
  • Psychological make-up

Question 15

Question
Phenotype of an individual refers to:
Answer
  • Physical make-up
  • Genetic make-up
  • Psychological make-up
  • Physiological make-up

Question 16

Question
A man with brown eyes and the genotype, BB and a woman with blue eyes and the gentoype, bb have a child. What will the genotype and phenotype of that child be?
Answer
  • BB and brown eyes
  • Bb and brown eyes
  • Bb and blue eyes
  • bb and blue eyes

Question 17

Question
A man and a woman both with brown eyes and the genotype, Bb have have a child. What is the correct ratio of brown eyes : blue eyes with regard to all the offsprings' phenotypes?
Answer
  • 1:1
  • 2:1
  • 3:1
  • 1:3

Question 18

Question
Which of the following genotypes correctly describes a human male?
Answer
  • X
  • Y
  • XY
  • XX

Question 19

Question
Which of the following genotypes correctly describes a human female?
Answer
  • X
  • Y
  • XY
  • XX

Question 20

Question
Which of the following genotypes correctly describes a male bird?
Answer
  • X
  • Y
  • XY
  • XX

Question 21

Question
Which of the following genotypes correctly describes a female bird?
Answer
  • X
  • Y
  • XY
  • XX

Question 22

Question
How many different possible gametes are there from an individual with the genotype XY?
Answer
  • 1
  • 2
  • 3
  • 4

Question 23

Question
How many different possible gametes are there from an individual with the genotype XX?
Answer
  • 1
  • 2
  • 3
  • 4

Question 24

Question
Incomplete dominance in genetics refers to:
Answer
  • alleles of an allelic pairs are equally expressed
  • alleles of an allelic pairs are not equally expressed
  • alleles of an allelic pairs are incompletely expressed
  • alleles of an allelic pairs are not expressed at all

Question 25

Question
A genetic cross between a red-flowered snapdragon plant and a white-flowered snapdragon plant demonstrated incomplete dominance. What colour were the flowers of the resulting offspring?
Answer
  • White
  • Red
  • Pink
  • Red and white

Question 26

Question
A genetic cross between two pink-flowered snapdragon plants produced a red, pink and white flowered plants in the resultant offspring. Which of the following ratios is correct for the resultant phenotypes (red : pink : white)?
Answer
  • 1:3:1
  • 1:2:1
  • 1:1:1
  • 1:4:1

Question 27

Question
Who is known as the father of genetics?
Answer
  • Henry Dixon
  • John Joly
  • Gregor Mendel
  • Alfred Russell-Wallace

Question 28

Question
The Law of Segregation states that:
Answer
  • Cells have two factors for each trait and these factors separate at fertilisation
  • Cells have two factors for each trait and these factors separate at gamete formation
  • Cells have one factor for each trait and this factor separates from all others at gamete formation
  • Cells have one factor for each trait and this factor joins with other factors at gamete formation

Question 29

Question
The Law of Independent Assortment states that:
Answer
  • Either member of a pair of factors can fuse with either member of another pair at gamete formation
  • Either member of a pair of factors can combine with either member of another pair at gamete formation
  • Either member of a pair of factors cannot separate from either member of another pair at gamete formation
  • Either member of a pair of factors will separate from each other at gamete formation

Question 30

Question
A pure-breeding pea plant for purple flowers and round seeds was crossed with a pure-breeding pea plant for white flowers and wrinkled seeds. All of the offspring from this cross produced purple flowers and round seeds. The offspring were 'selfed' and the F2 progeny produced showed 4 different phenotypes in a specific ratio. Which is the correct ratio of the F2 phenotypes?
Answer
  • 1:1:1:1
  • 4:3:2:1
  • 9:3:3:1
  • 9:6:3:1
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