2.6 - How is CF inherited?

Question 1

What does allele mean?

Answer 1

Different forms of a gene

Question 2

What does genotype mean?

Answer 2

The alleles present in an individual represented by betters

Question 3

What does phenotype mean?

Answer 3

The physical characteristics of an individual

Question 4

What does homozygous mean?

Answer 4

A genotype with two alleles that are the same

Question 5

What does heterozygous mean?

Answer 5

A genotype with two alleles that are different

Question 6

What does recessive mean?

Answer 6

Alleles that are only expressed in the phenotype if two are present

Question 7

What does dominant mean?

Answer 7

Alleles that are always expressed in the phenotype

Question 8

What is monohybrid inheritance?

Answer 8

When the inheritance of one single allele from two parents is studied.

Question 9

What are the steps when creating a punnet square ?

Answer 9

1- Give the parents genotypes
2- Give the possible parents gametes
3- Draw and fill in the Punnett square
4-Make a key matching genotypes to phenotypes
5- Give the probability or ratio

Question 10

How is CF inherited?

Answer 10

1- CF gene occurs in alternative forms or alleles.
2- The normal allele does not contain a mutation and is dominant.
3- The mutated allele is recessive.
4- One out of twenty five people are cystic fibrosis carriers.
5- Carriers can pass on an C or c in their gametes as they are heterozygous.

Question 11

What does codominace mean?

Answer 11

when both alleles are expressed

Question 12

what are Homologous chromosomes?

Answer 12

Homologous chromosomes are chromosomes that can pair as they contain sequences for the same genes.

Question 13

What does locus mean?

Answer 13

Locus means the position of a gene on a chromosome.

Question 14

What did Darwin believe happened when parents characteristics were inherited in sexual reproduction?

Answer 14

The characteristics are blended e.g. red and white would lead to pink flowers.

Question 15

What type of plant did Mendel use to work out how inheritance works?

Answer 15

Peas

Question 16

What did Mendel look after at the monastery?

Answer 16

The garden

Question 17

How long did Mendel’s study take? What did he keep?

Answer 17

10 years and a detailed record

Question 18

What pattern did Mendel notice?

Answer 18

If you breed red and white flower peas, the first generation will all have red flowers. The second generation will have red and white flowers.

Question 19

What fundamental law of inheritance did Mendel discover?

Answer 19

That each parent passes on a ‘factor’.

Question 20

Why were his findings not widely recognised until much later?

Answer 20

Only published in a small journal, language barrier, not a professional scientist, stopped his research and his notes were burnt.

Question 21

What do we call Mendel’s factors today?

Answer 21

Genes

Question 22

What were mendels conclusions?

Answer 22

There are inherited factors (genes), from parents, that control different characteristics.
-Some factors are stronger and show up more often, they are dominant.