Biology unit 4

Question 1

Recessive allele

Answer 1

An allele that effects the phenotype of an organism only when a dominant allele is not present

Question 2

Test cross

Answer 2

Testing a suspected heterozygote with a known homozygous recessive

Question 3

Gene

Answer 3

A section of DNA coding for the synthesis of a single polypeptide

Question 4

Heterozygous

Answer 4

A diploid organism that has inherited different alleles for the same gene from their parents

Question 5

Lock

Answer 5

The position of chromosomes where genes occurs

Question 6

Co dominant alleles

Answer 6

Pairs of alleles that both effect the phenotype when present in a heterozygote

Question 7

Genotype

Answer 7

The genetic construction of an organism

Question 8

Allele

Answer 8

One alternative form of a gene occupying a specific place on a chromosome

Question 9

Carrier

Answer 9

An individual with a recessive allele of a gene that does affect their phenotype

Question 10

Dominant allele

Answer 10

An allele that effects the phenotype of an organism, whether present in a homozygous or heterozygous condition

Question 11

Homozygous

Answer 11

A diploid organism that has inherited the same allele for a single gene from both parents

Question 12

Non disjunction

Answer 12

When homologous chromosomes fail to separate property during meiosis

Question 13

Phenotype

Answer 13

The characteristics or appearance of an organism

Question 14

Gene pool

Answer 14

All the alleles of all the genes of all individuals of a species at any one time

Question 15

Allelic frequency

Answer 15

The number of times an allele occurs within a gene pool

-p or q