Genetics

Question 0

Mono hybrid cross

Answer 0

Cross a homozygous recessive with a homozygous dominant

Question 1

What is the P generation, the F?

Answer 1

P is parent which are the individuals being crossed and F are the offspring

Question 2

What will the first generation of a mono hybrid cross be

Answer 2

All heterozygous

Question 3

What is the result of a self cross of two F1

Answer 3

25% PP, 50% Pp, and 25% pp. This is phenotypically a 3:1 ratio

Question 4

What is a test cross

Answer 4

Looking at the offspring to try and figure out the genotype of the parents

Question 5

In a dihybrid cross what are the results of the F1 and F2 generations

Answer 5

F1 is all heterozygous

F2 is 9:3:3:1 as a phenotypic ratio

Question 6

In a dihybrid cross what do you cross

Answer 6

Homozygous recessive for two traits with homozygous dominant for two traits

Question 7

When you cross a heterozygous dominant trait with a homozygous recessive one what is the approximate ratio of phenotypes in offspring

Answer 7

1:1

Question 8

When you cross a heterozygous with a heterozygous what is the approximate ratio of phenotype offspring

Answer 8

3:1

Question 9

What is the phenotypic ratio when you cross a heterozygous dominant trait with a homozygous recessive

Answer 9

1:1

Question 10

What is the phenotypic ratio when you cross two heterozygous

Answer 10

3:1

Question 11

Frequency of recombination can range from

Answer 11

0 to 50, 50 being completely unlinked

Question 12

What would happen if there was crossing over between sister chromatids

Answer 12

Nothing, thy are identical

Question 13

When does crossing over occur

Answer 13

Prophase 1

Question 14

One map unit corresponds to

Answer 14

A 1% chance of recombination occurring

Question 15

What happens to the F2 generation in incomplete dominance

Answer 15

1 red 2 pink 1 white vs the 3:1 phenotypic ratio

Question 16

Blood alleles Ia and Ib are

Answer 16

Codominant to O

Question 17

Penetrance

Answer 17

Number carrying allele who actually express the phenotype

Question 18

Expressivity

Answer 18

Various expression of disease symptoms despite identical genotypes

Question 19

Sex is determined by

Answer 19

Father

Question 20

If a male carries a mutation X they will be affected. This is called

Answer 20

Hemizygous

Question 21

What will the children of a male infected with a y linked disease e

Answer 21

Sons will all be affected no daughters will be

Question 22

What will the phenotype be if there is a carrier female and a normal male

Answer 22

50% of sons will have it, none will be carriers. Overall distribution is 25%

Question 23

If the mother is a carrier ad the dad has it

Answer 23

50% of daughters are hemopheliacs, 50% will be carriers. 50% of males will have it, 50% of make will be normal

Question 24

What is it called when someone has a variation of the 46 chromosomes

Answer 24

Aneuploid, most commonly disjunction

Question 25

XXX

Answer 25

Metafemales

Question 26

XXY

Answer 26

Klinefelter male

Question 27

Translocation

Answer 27

One chromosome adds to another

Question 28

Inversion

Answer 28

Inserts itself in opposite inversion