3.4 Modes of Inheritence

Question 1

3.4.U6 Definition: Autosomal

Answer 1

A disorder involving chromosomes 1-23 (not sex-linked)

Question 2

3.4.U1 What did Gregor Mendel do?

Answer 2

Discovered the principles of inheritance with experiments in which large numbers of pea plants were crossed.

Question 3

3.4.U1 Definition: Genotype

Answer 3

The combination of alleles of a gene carried by an organism

Question 4

3.4.U1 Definition: Phenotype

Answer 4

The expression of alleles of a gene carried by an organism

Question 5

3.4.U1 Definition: Centromere

Answer 5

Joins chromatids in cell division

Question 6

3.4.U1 Definition: Alleles

Answer 6

Different versions of a gene

Question 7

3.4.U1 Definition: Carrier

Answer 7

Heterozygous carrier of a recessive disease-causing allele

Question 8

3.4.U1 Definition: Homozygous Dominant

Answer 8

Having two copies of the same dominant allele

Question 9

3.4.U1 Definition: Homozygous Recessive

Answer 9

Having two copies of the same recessive allele. Recessive alleles are only expressed when homozygous

Question 10

3.4.U1 Definition: Codominant

Answer 10

Pairs of alleles which are both expressed when present

Question 11

3.4.U1 Definition: Heterozygous

Answer 11

Having to different alleles. The dominant allele is expressed.

Question 12

3.4.U1 Definition: Gene loci

Answer 12

Specific positions of genes on a chromosome