Inheritance

Question 1

different characteristics are controlled by different…

Answer 1

genes

Question 2

different forms of a gene are called …

Answer 2

alleles

Question 3

how many genes are there for each characteristic?

Answer 3

2

Question 4

is cystic fibrosis recessive or dominant?

Answer 4

recessive

Question 5

Explain genotype and phenotype

Answer 5

the alleles present, the genotype, operate at a molecular level to develop characteristics that can be expressed as a phenotype

Question 6

what are the symptoms of cystic fibrosis, and what type of allele is it caused by?

Answer 6

sticky mucus is produced so it is difficult to breathe, caused by a recessive allele on chromosome 7

Question 7

what does sickle cell anemia do?

Answer 7

changes the protein in red blood cells so that they are shrivelled and carry less oxygen
cant get malaria

Question 8

what is a monohybrid cross?

Answer 8

a cross where the two parents are homozygous - eg TT and tt

Question 9

how is sex detirmined?

Answer 9

x and y chromosomes

Question 10

what is polydactyly and what type of allele is it caused by?

Answer 10

extra fingers. Caused by a dominant allele.