module 6 - 19.7 linkage, gender & sex linkage

Question 1

what are sex chromosomes?

Answer 1

chromosomes that carry the sex-determining genes

Question 2

what are autosomes?

Answer 2

• any chromosome that isn’t a sex chromosome
• autosomes may have same genes but different alleles of genes

Question 3

what are alleles?

Answer 3

different versions of a gene

Question 4

what are chromosomes arranged into?

Answer 4

homologous pairs

Question 5

what does it mean if we say that genes are linked?

Answer 5

when 2 genes appear on the same chromosome

Question 6

what is autosomal linkage?

Answer 6

when 2 or more genes appear on the same autosome

Question 7

what is the number of linkage groups equal to?

Answer 7

haploid number of chromosomes because each chromosome carries the same genes as its homologous partner

Question 8

what can genes that exhibit autosomal linkage not do?

Answer 8

cannot segregate independently at meiosis (metaphase 1)

Question 9

what is sex linkage?

Answer 9

the expression of an allele dependent on the gender of the individual as the gene is located on a sex chromosome

Question 10

what are sex linked genes?

Answer 10

genes located on a sex chromosome, so allele expression depends on the sex of the individual