Lecture 10

Question 1

What is sex in biology?

Answer 1

the fusion and reshuffling of genomes from two parents resulting in new combinations
- 2 cells become 1

Question 2

What does biological sex involve?

Answer 2

specialized haploid cells (gametes) that fuse to form a diploid zygote
- many creatures make gametes by mitosis instead of meiosis

Question 3

What is the gametophyte?

Answer 3

• haploid
• produce gametes by mitosis

Question 4

How are spores usually produced

Answer 4

by meiosis

Question 5

What is the difference between sex and reproduction?

Answer 5

sex = two cells become one
reproduction = one cell becomes two

Question 6

Is the association between mate attraction, mating, genders, reproduction, and sex so close in all species as in humans

Answer 6

no

Question 7

In many Eukarya, reproduction does not involve sex, and sex may not involve reproduction

Answer 7

True

Question 8

Can fungi have sex even though they don’t have gametes or gender?

Answer 8

yes

Question 9

true false: bacteria and archaea show no gender at all, or sex defined her, but readily incorporate new genetic material into their genomes

Answer 9

True

Question 10

How is sex in the ciliate paramecium

Answer 10

• no gametes, no genders, no reproduction
• macro and micro nucleus has same genome, two line up and exchange a copy of micronucleus and becomes new genome

Question 11

what is sex determination

Answer 11

how an individual becomes male or female