Module 7- Inheritance

Question 1

Define gene

Answer 1

Sequence of DNA nucleotide bases

Question 2

Define allele

Answer 2

Altnernative form of a gene

Question 3

Define recessive allele

Answer 3

The allele determines a characteristic only if no dominant allele is present

Question 4

Define dihybrid

Answer 4

Inheritance of 2 genes

Question 5

Define monohybrid

Answer 5

Inheritance of 1 gene

Question 6

Define dominant allele

Answer 6

This allele determines the development of a characteristic, even if one copy is present

Question 7

Define a homozygous chromosome

Answer 7

A pair of chromosomes that have the same alleles of a gene

Question 8

Define a heterozygous chromosome

Answer 8

A pair of chromosomes that have different alleles of a gene

Question 9

Define gametes

Answer 9

An egg cell or a sperm cell

Question 10

Define genotype

Answer 10

The alleles present in an organism

Question 11

Define phenotype

Answer 11

The physical appearance of an individual

Question 12

Define multiple gametes

Answer 12

A gene that has many different forms e.g. blood group

Question 13

Define condominance

Answer 13

When both alleles are expressed equally

Question 14

2 marks

Males are more likely than females to show a phenotype produced by a recessive allele carried on the X chromosome. Explain why.

Sex-linked genes

Answer 14

1. Males have only one allele
2. Females need two recessive alleles