Chapter 14-mendel

Question 1

Why did he choose to work with peas

Answer 1

There are many varieties;short generation time; large number of offspring;he could control mating

Question 2

Hybridisation

Answer 2

The mating or crossing of two true breeding varieties

Question 3

Name the 4 parts of Mendel’s model

Answer 3

1. Alternative versions of genes account for variation in inhertable characteristics
2. For each character, an organism receive two copies of a gene, one from each parent
   3.If the alleles at one locus differ, one is dominant and the other is recessive
3. The law of segregation

Question 4

The law of segregation

Answer 4

Two alleles for a heritable characteristic segregate during gamete formation to and end up in different gametes

Question 5

Law of independent assortment

Answer 5

Two or more genes assort independently-that is,each pair of alleles segregated independently of each other pair of alleles-during gamete formation

Question 6

Incomplete dominance

Answer 6

Neither allele is completely dominant and the F1 hybrids have a phenotype somewhere in between the two parental variants(eg snapdragons)

Question 7

Codominance

Answer 7

When two alleles each affect the phenotype in separate, distinguishable ways (eg MN blood group)

Question 8

Pleiotropy

Answer 8

One gene has multiple phenotypic affects

Question 9

Epistaxis

Answer 9

Where one gene affects the phenotype because the two gene products interact (eg labs)

Question 10

Polygenic inheritance

Answer 10

And additive effect of two or more genes on a single phenotypic character

Question 11

Mono hybrid

Answer 11

Heterozygous for one particular trait being followed in the cross

Question 12

Incomplete dominance

Answer 12

The F1 hybrids have a phenotype somewhere betweeen those of the 2 parental varieties(eg. Snapdragons-pink F1)