1. The great variety of
possible gene
combinations in a
sexually reproducing
species is due in part to the
(1) sorting of genes as a result of gene replication
(2) pairing of genes as a result of mitosis and certain
types of cancer
(3) pairing of genes as a result of differentiation
(4) sorting and recombining genes of meiosis and
fertilization
Mom’s genes + Dad’s genes = Baby’s

3. The diagram shows stages of human reproduction.
Zygote
With ALL genetic information
The direct result of fertilization is represented at
(1) A (2) B (3) C (4) D

4. Fertilization occurs when gametes unite.

5. Fertilization occurs when gametes unite
Fertilization occurs when gametes unite. Gametes are produced by meiosis.

6. Fertilization occurs when gametes unite
Fertilization occurs when gametes unite. Gametes are produced by meiosis. Meiosis occurs in gonads.

7. Let’s study your gonads…
Fertilization occurs when gametes unite.
Gametes are produced by meiosis.
Meiosis occurs in gonads.
Ovaries and Testis are Gonads.
Let’s study your gonads…

8. We ALL begin developing two ovaries.
If a Y chromosome makes us “male” then these gonads will instead become Testis.
OVARIES
TESTIS

9. Gonads also make SEX HORMONES.
Sex hormones promote gamete production and direct Secondary Sex Characteristics.
OVARIES
TESTIS

10. Females have ovaries.
Ovaries produce Estrogen and Progesterone.
Secondary female sex characteristics are…?

11. Males have testis.
Testis produce Testosterone.
Secondary male sex characteristics are…?

12. Males make female sex hormones and females make male ones…

13. The diagram represents human reproductive systems.
Which statement best describes part of the human reproductive process?
(1) A and D produce hormones and are the sites
of meiosis
(2) Testosterone produced in D influences
formation of sperm within B.
(3) Sperm produced in B influences meiosis in C.
(4) D is the site of embryo development .