Lab 6

Question 1

autosomes

Answer 1

the remaining non-sex chromosomes in the nucleus

Question 2

karyotype

Answer 2

a photograph of the chromosomes of an actively dividing cell, showing the number, shape and size of the chromosomes

Question 3

Only having 1 x-chromosome and phenotypes

Answer 3

Turners syndrome
-short arms and neck
-cant reproduce and mensurate
-kidney problems
-swelling of hands + feet

Question 4

Having 3 chromosome 21’s and phenotypes

Answer 4

down syndrome
-developmental delay
-small ears
-flattened face

Question 5

Having 2 X-chromosomes and 1 Y-chromosome and phenotypes

Answer 5

Klinefelter’s syndrome
thick hair
small testes
large breasts

Question 6

Genes located on the X-chromosome

Answer 6

sex-linked genes

Question 7

Who is more likely to have a sex-linked disease and why

Answer 7

males because they only have one X-chromosomes

Question 8

What are heterozygous sex linked traits called

Answer 8

carriers

Question 9

protan deficiency

Answer 9

caused by reduced numbers or a complete absence of red photoreceptors in the eye, which means they can’t see red or its very dark for them

Question 10

deutan deficiency

Answer 10

caused by reduced numbered or a complete absence of green photoreceptors meaning they can’t see green or it’s very dark to them

Question 11

who do sex-linked recessive traits effect more

Answer 11

males

Question 12

who does sex-linked dominant traits effect more

Answer 12

females

Question 13

Parents of affected individuals of autosomal recessive traits

Answer 13

parents are unaffected

Question 14

parents for affected individuals of autosomal dominant traits

Answer 14

have at least one affected parent

Question 15

Huntington’s disease

Answer 15

disease that causes degeneration of brain cells resulting in deterioration of physical and mental abilities

Question 16

Is this autosomal or sex-linked
Dominant or recessive

Answer 16

Autosomal
Dominant

Question 17

polygenic traits and examples

Answer 17

phenotypic traits that involve contributions from the alleles of many genes at multiple locations an don sperate chromosomes

height
skin colour

Question 18

the crossover frequency between two linked genes is proportional to

Answer 18

the distance between them

Question 19

if genes are close together what is the probability of crossing over and how many recombinant genes would result

Answer 19

low probability of crossover

low number of recombinant genes

Question 20

how to calculate percent recombination

Answer 20

total # of recombinants
——————————- x100
total # of offspring

Question 21

which parents gamete determine the sex of offspring in humans

Answer 21

male (y-chromosome)

Question 22

individuals that have only one X-chromosome have a condition called ______ syndrome. Are they phenotypically male or female?

Answer 22

Turners
female

Question 23

In traits in Mendelian fashion, are dominant phenotypes always the most common in a population

Answer 23

no

Question 24

Example of a sex-linked trait

Answer 24

hemophilia

Question 25

genotype of an individual that is a carrier of sex-linked recessive disorder

Answer 25

Xg XG

Question 26

In polygenic traits the effects of _____ alleles are _____

Answer 26

dominant
additive

Question 27

What is this called

Answer 27

Karyotype