Genetic Variation - chuck test 2

Question 1

Co-Dominances

Answer 1

An individual who is heterozygous and expresses both phenotypes associated with both alleles and are equally and independently expressed.

Question 2

Complete Dominance

Answer 2

A relationship between alleles of a single gene, in which one allele masks the phenotypic expression of another allele at the same gene locus.

Question 3

Incomplete Dominance

Answer 3

Neither allele is dominant and the heterozygotes is intermediate in phenotype between the two homozygotes. A heterozygous individual which phenotype is a combination of both alleles phenotype.

Question 4

Multiple Alleles

Answer 4

Two or more alleles present in a species for a particular gene

Question 5

Lethal Allele

Answer 5

Gene mutations result in gene product which is not only functional but also affects the organism’s chances of survival. Lethal alleles are alleles that cause an organism to die when present in a homozygous condition.

Question 6

Pure breeding

Answer 6

A group of identical individuals that always produce offspring of the same phenotype when intercrossed.

Question 7

Test Crossing

Answer 7

crossing an unknown genotype individual with a homozygous recessive individual to determine the unknown individual’s genotype. This is done to determine whether the genotype is heterozygous or homozygous dominate

Question 8

Linked Genes

Answer 8

When two alleles are on the same chromosome and are often inherited together