Curriculum
Course: Cambridge AS & A Level Biology 9700 ...
Login

Curriculum

Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/34

17-18 · Selection, Evolution, Classification and Conservation

0/69

19 · Genetic Technology

0/44
Quiz

16.2 The Roles of Genes in Determining the Phenotype – Check yourself

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit

Roles of Genes in Determining the Phenotype AS Biology check yourself quiz: free practice for AS Biology. Work through this Roles of Genes in Determining the Phenotype AS Biology check yourself quiz and get instant feedback on every answer. If you get stuck, review the 16.2 The Roles of Genes in Determining the Phenotype — 9700 Notes lesson. More practice: AS Biology — all units. Syllabus: Cambridge AS & A Level Biology 9700 syllabus.

  • Questions count: 17
  • Passing grade: B
Start Quiz
1.

A monohybrid cross between two heterozygotes gives a phenotypic ratio of

3 : 1
1 : 1
9 : 3 : 3 : 1
1 : 2 : 1 for full dominance
2.

A dihybrid cross between two double heterozygotes for unlinked genes gives a ratio of

9 : 3 : 3 : 1
3 : 1
1 : 1 : 1 : 1
9 : 7
3.

A test cross involves crossing an organism showing the dominant phenotype with

a homozygous recessive organism
a heterozygote
a homozygous dominant organism
itself
4.

In codominance

one allele masks the other
neither allele is expressed
the alleles are on different chromosomes
both alleles are expressed in the phenotype of the heterozygote
5.

Sex-linked recessive conditions such as haemophilia are more common in males because

males have only one X chromosome
males have two X chromosomes
the gene is on the Y chromosome
females cannot carry the allele
6.

Autosomal linkage means that two genes

are on different chromosomes
are on the same autosome and tend to be inherited together
are on the sex chromosomes
assort independently
7.

Epistasis is

the presence of multiple alleles
a type of mutation
the interaction of genes at different loci, where one gene affects the expression of another
sex linkage
8.

The chi-squared test is used in genetics to

test whether observed and expected ratios differ significantly
calculate allele frequency
find the mean
measure variation
9.

Sickle cell anaemia is caused by

a base substitution in the gene for the β-globin polypeptide
an extra chromosome
a deletion of a whole gene
a virus
10.

The TYR gene codes for tyrosinase; a recessive mutant allele causes albinism because

too much melanin is produced
the gene is duplicated
tyrosine cannot be absorbed
no functional enzyme is made, so melanin is not produced
11.
IGCSE Biology 17.1 DNA, Chromosomes, genes and ALLELES (X, Y) - Question 5
IGCSE Biology 17.1 DNA, Chromosomes, genes and ALLELES (X, Y) - Question 5
A
B
C
D
12.
Which statement best describes Genotype?
An interaction in which the allele of one gene masks or modifies the expression of a different gene.
A situation in which both alleles in a heterozygote are fully expressed in the phenotype.
The combination of alleles an organism carries for a particular gene.
A statistical test comparing observed with expected frequencies to decide whether any difference is due to chance.
13.

An allele is

an alternative form of a gene
a chromosome
a gamete
a protein
14.

The phenotype is

the genetic make-up
the observable features of an organism
a type of allele
a gamete
15.

An organism with two identical alleles of a gene is

heterozygous
dominant
homozygous
recessive
16.

A dominant allele

is expressed only when homozygous
is never expressed
is always harmful
is expressed if it is present
17.
Mendel chose the pea plant for all of the following reasons EXCEPT:
It has clear traits with two contrasting forms
All of its traits show incomplete dominance
It naturally self-pollinates and can be cross-pollinated by hand
It grows quickly and produces many seeds
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
Part of 16 · Inherited Change — see every lesson and quiz in this unit.
Accepted payment methods