The great variety of possible gene combinations in a

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Presentation transcript:

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

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

Fertilization occurs when gametes unite.

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

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

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…

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

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

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

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

Males make female sex hormones and females make male ones…

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 .