Medelian During Lecture

Question 1

Define character

Answer 1

Heritable feature, eg flower colour

Question 2

Define a trait

Answer 2

Each variant of a character: eg purple and white flower

Question 3

Define a gene

Answer 3

A discrete unit of hereditary information, eg P gene

Question 4

Define an allele

Answer 4

Alternative versions of a gene, eg P and p allele

Question 5

Define a genotype

Answer 5

Genetic make up of an organism (a set of alleles)

Question 6

Define a phenotype

Answer 6

Observable physical traits of an organism

Question 7

what does mendels first law show?

Answer 7

that two alleles of a gene segregate from one another during gamete formation in anaphase 1

Question 8

what is the product rule?

Answer 8

the probablitity of two independant events both occuring and the product of their probabilities.

it is the genotypic product rule: 1/2 x 1/2= 1/4

Question 9

what is the sum rule?

Answer 9

the probability of either or one of the events occuring.

phenotypic sum rule: 1/4 + 1/4= 3/4

Question 10

what are the ratios of a

dihybrid cross

monohybrid cross

test cross

Answer 10

dihybrid: 9:3:3:1
monohybrid: 3:1

test cross: 1:1