inheritance of sex chromosomes

Question 1

What are chromosomes other than sex chromosomes called

Answer 1

autosomes

Question 2

T/F many animals have a unmatched chromosome pair

Answer 2

sex chromosomes (x, y)

Question 3

The human x chromosomes is more than 150mb long but the y is

Answer 3

50 mb

Question 4

meiosis in females results in

Answer 4

x-bearing eggs only

Question 5

meiosis in males results in

Answer 5

1:1 ration of x and y bearing sperm

Question 6

what is x-linkage

Answer 6

mutation carried via x chromosome

1.) during meiosis in men, the mutant x chromosome segregates from the y chromosome and combined with a normal x-bearing egg
2.) resulting female offspring are heterozygous and have only one copy of mutant allele (recessive). all have red eyes
3.) resulting male offspring are red eyed because they receive their x from their wild-type mother (red-eye)

Question 7

Inherited mitochondrial diseases are often associated with

Answer 7

muscle weakness due to inefficient atp supply

Question 8

All the offspring from a mother with a mitochondrial dna inheritance disease will

Answer 8

express the trait, males no do transmit traits

Question 9

what is a haplotype

Answer 9

group of genes within an organism that was inherited together from a single parent

Question 10

what are the properties of y-linkage genes

Answer 10

• only males exhibit the trait
• all sons of males with the trait will express the trait
• SRY gene in the y chromosome encodes a protein that is the trigger for male development

Question 11

the distance between adjacent genes given in a genetic map is equal to

Answer 11

the frequency of recombination when expressed as a percentage

Question 12

what are the traits of nonrecombinant chromosomes

Answer 12

• can appear when crossing over doesnt take place between 2 genes
• frequency of recombination is a measure of distance between linked genes
• when 2 genes are on separate chromosomes, the ration 1:1:1:1 is expected for the nonrecombinant and recombinants gametes

Question 13

What are recombinants

Answer 13

fewer numbers of progeny , has the w+cv- and w-cv+ genotypes; resulting from a cross over of homologous chromosomes

Question 14

what are nonrecombinants

Answer 14

have genotypes found in one of the parents

Question 15

nonrecombinants and recombinants are properties of

Answer 15

f2 progeny

Question 16

f1 cross is when

Answer 16

• offspring crossed to each other (brother/sister matings)
• female progeny were all wild type because they recieved the crossveinde x chromosome from their fathers
• each male progency recieves its x chromosome from their mother and a y from their father so the phenotype of aeach male immediately reveals the genetic constitution of the x chromosome that the male inherited from the mother