bio 6

Question 1

what letters signal that is heterozygous

Answer 1

Dd-a capital letter and a lower case letter

Question 2

what letters signal that is homozygous

Answer 2

DD or dd-both capital or lower case

Question 3

advantages of embryonic screening

Answer 3

can find out if the embryo has a inherited disorder

can prepare for the baby

can decide whether to carry on with the pregnancy

Question 4

what is the genome?

Answer 4

the entire genetic material

Question 5

asexual reproduction

Answer 5

requires one parent to produce offspring
there is no fusion of gametes
offspring are genetically identical to the parent or to each other meaning they are clones
exact copies of the genetic information

Question 6

process of meiosis:

Answer 6

only takes place in reproductive organs-testes in males and ovaries in females

1.all the chromosomes are copied
2.the cell then divides into two
3.now both of these cells divide one more time to form gametes
4.the chromosomes are single not paired -halved the number of chromosomes
5.four gametes-genetically different

Question 7

what is a gamete

Answer 7

is a sex cell and contains 23 chromosomes

Question 8

what is an allele?

Answer 8

a specific form of a gene

Question 9

what does recessive mean?

Answer 9

a recessive trait will only be expressed if the individual has two copies of the recessive allele for example (bb)

Question 10

how to tell whether it it is dominant or recessive

Answer 10

if it is Bb then it is dominant-heterozygous as it has a capital letter but if it was bb then it would be recessive-homozygous

Question 11

what happens if the individual has one dominant and one recessive allele

Answer 11

if the individual has one recessive and one dominant allele the dominant trait will be expressed

Question 12

what does a mutation mean?

Answer 12

a change in the organisms DNA