Reading 19

Question 1

What process causes the genetic variation seen in offspring produced by sexual reproduction?

Answer 1

-meiosis

Question 2

True or False: Autosomes are the same between females and males

Answer 2

true

Question 3

What does the term heterogametic sex describe?

Answer 3

-when males produce 2 different types of gametes with respect to the sex chromosome

Question 4

What does the term homogametic sex describe?

Answer 4

-when females produce 2 of the same gametes with respect to the sex chromosome

Question 5

How is it that sex chromosomes can pair during meiosis?

Answer 5

-there are homologous small regions called pseudo autosomal regions

Question 6

What is meant by ‘genic sex determination’?

Answer 6

-there are no sex chromosomes and sex determined genetically

Question 7

How does the duckbill platypus differ from human in terms of its sex chromosomes?

Answer 7

-they have 5 sex chromosomes

Question 8

What is the SRY gene? Where is it found?

Answer 8

A gene on the Y chromosome that sometimes determines maleness

Question 9

What is a Barr body? How does the Barr body relate to the Lyon hypothesis?

Answer 9

-an inactive X chromosome
-if a cell contains more than 2 X, one of them is inactive

Question 10

What is meant by cytoplasmic inheritance?

Answer 10

-characteristics encoded by genes in the cytoplasm