Inheritance And Variation

Question 1

What does heterozygous mean?

Answer 1

Different alleles

Question 2

What does homozygous mean?

Answer 2

Same alleles

Question 3

What are alleles?

Answer 3

Different forms of the same gene

Question 4

What are genes?

Answer 4

DNA which codes for polypeptides, characteristics

Question 5

What is the genotype?

Answer 5

Combination of alleles

Question 6

What allele is expressed?

Answer 6

Dominant

Question 7

What is discontinuous variation?

Answer 7

Controlled by a few genes eg. Blood group

Question 8

What is continuous variation?

Answer 8

Controlled by a group of genes eg. Height

Question 9

What type of allele is cystic fibrosis?

Answer 9

Recessive

Question 10

What type of allele is polydactyly?

Answer 10

Dominant

Question 11

What is the position of genes called?

Answer 11

Loci which are in the same place on both maternal and paternal chromosomes

Question 12

What does autosomal mean?

Answer 12

Recessive gene not found on a sex chromosome and so is found on 1 to 22 chromosome

Question 13

What are sex linkage genes?

Answer 13

Genes carried on sex chromosomes

Question 14

What is the ratio when 2 heterozygous parents breed?

Answer 14

9:3:3:1

Question 15

What is the ratio when a heterozygous a recessive parents breed?

Answer 15

1:1:1:1