Inheritance D3.2 review

Question 1

If the alleles for red eyes and brown bodies are dominant to the alleles for white eyes and yellow bodies. which cross would be suitable to determine whether the genes are linked?

Answer 1

Heterozygous red eyed, brown bodied flies crossed with white eyed, yellow bodied flies

Question 2

Two parents both heterozygous for sickle cell anemia, have one unaffected child and one child with a mild form of the disease. What are the chances that their next child will be unaffected?

Answer 2

25%

Question 3

What is the difference between DNA of adult monozygotic (identical) twins?

Answer 3

Methylation pattern

Question 4

What is the proteome of an individual?

Answer 4

The protein synthesized as an expression of an individuals genes

Question 5

How many chromosomes are there in a cell during anaphase of mitosis, if the diploid number of the cell is 20?

Answer 5

40

Question 6

What is produced by meiosis in a cell of a male animal?

Answer 6

Four gametes, each w/ the same number of chromosomes

Question 7

In which stage of the cycle are chromosomes duplicated?

Answer 7

S phase

Question 8

For what reason do gametes contain only one allele of each gene?

Answer 8

B/c Haploid cells contain only one set of chromosomes

Question 9

Non disjunction of chromosome 21 causes trisomy. what can be said about the incidence of non-disjunction in chromosome 21?

Answer 9

It ingreatly with maternal age after 30Y

Question 10

What occurs during the first division of meiosis?

Answer 10

Halving of the chromosome number

Question 11

Which process occurs in meiosis and mitosis?

Answer 11

DNA replication

Question 12

A strand of DNA containing four codons with base sequence ACT GTA CTC TAC mutates, changing base sequence to ACT ATG CTC TAC. what time of mutation has occured?

Answer 12

substitution