John Loughlin
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Revision questions on genetics and inheritance for Leaving Cert Biology

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John Loughlin
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Chapter 16: Genetics Revision Questions

Question 1 of 30

1

Genetics is the study of:

Select one of the following:

  • The nucleus

  • RNA

  • DNA

  • Inheritance

Explanation

Question 2 of 30

1

Inheritance is:

Select one of the following:

  • 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.

Explanation

Question 3 of 30

1

A gamete is:

Select one of the following:

  • A diploid cell

  • A triploid cell

  • A haploid sex cell

  • A bacterial cell

Explanation

Question 4 of 30

1

Meiosis is important in sexual reproduction because it produces:

Select one of the following:

  • New cells

  • Sex cells

  • Diploid cells

  • Zygotes

Explanation

Question 5 of 30

1

In humans there are ___________ chromosomes in each sex cell.

Select one of the following:

  • 46

  • 23

  • 92

  • 22

Explanation

Question 6 of 30

1

Fertilisation is:

Select one of the following:

  • 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

Explanation

Question 7 of 30

1

An alternative form of a gene is known as:

Select one of the following:

  • An allele

  • A locus

  • A gentoype

  • A phenotype

Explanation

Question 8 of 30

1

A locus is:

Select one of the following:

  • 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

Explanation

Question 9 of 30

1

Which of the following terms correctly describes the situation when two alleles are identical?

Select one of the following:

  • Heterozygous

  • Dominance

  • Recessive

  • Homozygous

Explanation

Question 10 of 30

1

Which of the following terms correctly describes the situation when two alleles are different?

Select one of the following:

  • Homozygous

  • Heterozygous

  • Recessive

  • Dominance

Explanation

Question 11 of 30

1

Pure-breeding means the same as:

Select one of the following:

  • Homozygous

  • Heterozygous

  • Recessive

  • Dominance

Explanation

Question 12 of 30

1

Dominance in genetics refers to:

Select one of the following:

  • 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

Explanation

Question 13 of 30

1

Recessive in genetics refers to:

Select one of the following:

  • 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

Explanation

Question 14 of 30

1

Genotype of an individual refers to its:

Select one of the following:

  • Genetic make-up

  • Physical make-up

  • Physiological make-up

  • Psychological make-up

Explanation

Question 15 of 30

1

Phenotype of an individual refers to:

Select one of the following:

  • Physical make-up

  • Genetic make-up

  • Psychological make-up

  • Physiological make-up

Explanation

Question 16 of 30

1

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?

Select one of the following:

  • BB and brown eyes

  • Bb and brown eyes

  • Bb and blue eyes

  • bb and blue eyes

Explanation

Question 17 of 30

1

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?

Select one of the following:

  • 1:1

  • 2:1

  • 3:1

  • 1:3

Explanation

Question 18 of 30

1

Which of the following genotypes correctly describes a human male?

Select one of the following:

  • X

  • Y

  • XY

  • XX

Explanation

Question 19 of 30

1

Which of the following genotypes correctly describes a human female?

Select one of the following:

  • X

  • Y

  • XY

  • XX

Explanation

Question 20 of 30

1

Which of the following genotypes correctly describes a male bird?

Select one of the following:

  • X

  • Y

  • XY

  • XX

Explanation

Question 21 of 30

1

Which of the following genotypes correctly describes a female bird?

Select one of the following:

  • X

  • Y

  • XY

  • XX

Explanation

Question 22 of 30

1

How many different possible gametes are there from an individual with the genotype XY?

Select one of the following:

  • 1

  • 2

  • 3

  • 4

Explanation

Question 23 of 30

1

How many different possible gametes are there from an individual with the genotype XX?

Select one of the following:

  • 1

  • 2

  • 3

  • 4

Explanation

Question 24 of 30

1

Incomplete dominance in genetics refers to:

Select one of the following:

  • 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

Explanation

Question 25 of 30

1

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?

Select one of the following:

  • White

  • Red

  • Pink

  • Red and white

Explanation

Question 26 of 30

1

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)?

Select one of the following:

  • 1:3:1

  • 1:2:1

  • 1:1:1

  • 1:4:1

Explanation

Question 27 of 30

1

Who is known as the father of genetics?

Select one of the following:

  • Henry Dixon

  • John Joly

  • Gregor Mendel

  • Alfred Russell-Wallace

Explanation

Question 28 of 30

1

The Law of Segregation states that:

Select one of the following:

  • 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

Explanation

Question 29 of 30

1

The Law of Independent Assortment states that:

Select one of the following:

  • 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

Explanation

Question 30 of 30

1

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?

Select one of the following:

  • 1:1:1:1

  • 4:3:2:1

  • 9:3:3:1

  • 9:6:3:1

Explanation

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