Today Meiosis producing genetically diverse offspring and inheritance
- Slides: 55
Today: Meiosis, producing genetically diverse offspring, and inheritance
{Meiosis: producing gametes} For life to exist, the information (genes) must be passed on. {Mitosis: producing more cells}
Voles Prairie Montane • Monogamous • Nonmonogamous • Both parents care • Mother cares for young briefly
Voles Prairie Montane • Monogamous • Nonmonogamous • Both parents care for • Mother cares for young briefly Same levels of oxytocin and vasopressin • More receptors • Less receptors
Why might these voles use different reproductive strategies? Prairie voles: Montane voles: Resource poor Resource rich habitat • Monogamous • Nonmonogamous • Both parents care • Mother cares for young briefly
haploid X 23 in humans diploid X 23 in humans Sexual Reproduction = The combination of genes inherited from Mom and Dad.
Asexual Reproduction extremely low genetic diversity vs. Sexual Reproduction greater genetic diversity
Asexual Reproduction genetically identical to parent (this tree can reproduce both sexually and asexually)
Why does sexual reproduction exist? Cons: • Need two individuals • Hard to find mate • Diseases/Competition Pros: • Genetic diversity
Screw worm flies
F M sterile Sterile male screw worm flies led to decreased populations because of screw worm monogamy.
F M sterile In most other species, because females mate with multiple males, introduction of sterile males has little effect. Sterile male screw worm flies led to decreased populations because of screw worm monogamy. F M sterile
In most other species, because females mate with multiple males, introduction of sterile males has little effect. Hi, want to study biology together? M F fertile F M sterile
10 -40% of offspring in “monogamous” bird species are fathered by an extra-pair male
• Social Monogamy = pair lives/works together, but not “faithful” • Sexual Monogamy = pair raise young and only copulate with each other
In mammals, child-rearing is most commonly done by the female. She provides milk.
Less than 0. 01% of mammals are monogamous
Do Males and Females have different attitudes toward sex and relationships?
On a college campus an attractive male or female asked the opposite sex: “I have been noticing you around campus. I find you very attractive…” Female answers: Male answers: …Would you go out with me tonight? = 50% yes
On a college campus an attractive male or female asked the opposite sex: “I have been noticing you around campus. I find you very attractive…” Female answers: Male answers: …Would you go out with me tonight? = 50% yes …Would you come to my apartment tonight? = 6% yes = 69% yes
On a college campus an attractive male or female asked the opposite sex: “I have been noticing you around campus. I find you very attractive…” Female answers: Male answers: …Would you go out with me tonight? = 50% yes …Would you come to my apartment tonight? = 6% yes = 69% yes …Would you go to bed with me tonight? = 0% yes = 75% yes
Why do Males and Females have different attitudes toward sex and relationships?
The male perspective on monogamy
Eggs require large resource input. A clutch of bird eggs can be ~20% of bird’s weight. Sperm are cheap.
Human Females: ~1 egg/month Human Males: 250, 000 sperm/ ejaculation
The female reproductive system
Sperm competition: Sperm can survive for several days in a woman’s reproductive tract. In Great Britain in a survey of 4, 000 women… 0. 5% had sex with 2 different men within 30 minutes… 30% within 24 hours = sperm competition.
The female reproductive system
Female mammals provide additional resources in form of milk.
Mating pairs share genetic information and possibly help in child-rearing
What are the consequences of the different male and female attitudes toward sex and relationships?
Zebra Finch
Zebra finch pairs were allowed to mate ~9 times
Then a new male was brought in and allowed to mate with the female once.
Last male advantage The last male that only mated once fathered 54% of offspring Original male (mated 9 times) fathered 46% of offspring
Last male advantage To ensure fatherhood males mate guard and produce copious quantities of sperm
Purple Martins After successfully mating, male purple martins call and attract younger males
The older males then cuckold the younger male’s females Younger males with nests near older males only father 29% of eggs in their nests.
Older males produce 4. 1 offspring with their mate and 3. 6 by younger neighbor’s mate. Younger males with nests near older males only father 29% of eggs in their nests.
Older males produce 4. 1 offspring with their mate and 3. 6 by younger neighbor’s mate. What advantage is their for females to accept or solicit EPCs?
Gunnison’s Prairie Dogs Sexually monogamous female squirrels have a 92% chance of successfully giving birth.
Gunnison’s Prairie Dogs Sexually monogamous female squirrels have a 92% chance of successfully giving birth. Non-monogamous females have a 100% chance of giving birth
Can females detect compatible genes? http: //www. pbs. org/wgbh/evolution/library/01/6/l_016_08. html
How can a female know which male has successful genes?
Females may choose traits, like large displays, that are disadvantageous for male survival.
How can females determine “good” males?
Color: Bright coloring can be correlated with health…
But a male with a mate is judged as being high quality even if he is less colorful
How does evolution work for a behaviors such as monogamy? monogamous bye non-monogamous
Voles Prairie Montane • Monogamous • Nonmonogamous • Both parents care for • Mother cares for young briefly Same levels of oxytocin and vasopressin • More receptors • Less receptors
How does evolution work for a behaviors such as monogamy? monogamous bye non-monogamous
How does evolution work for a behaviors such as monogamy? After several generations… monogamous non-monogamous
• Males must choose between having more offspring (more mates) or helping to raise fewer offspring (sperm do not require many resources) • Females choose males that can provide “good” genes or resources for offspring (eggs, gestation, and/or lactation require high resource input)
Am I the only one? Am I better off helping with these kids or should I mate with someone else? Is this the best I can do? Maybe I can find someone with better genes or more genetic diversity.
Asexaul Reproduction extremely low genetic diversity vs. Sexaul Reproduction greater genetic diversity How does sexual reproduction generate genetic diversity?
- Diverse offspring
- The creation of genetically identical offspring
- Diversity among protoctista
- Meiosis genetic variation
- Differences between mitosis and meiosis
- Chapter 10 section 1 meiosis
- Meiosis introduction activity
- Chapter 22 genetics and genetically linked diseases
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- Meiosis i vs meiosis ii
- Meiosis 1 and 2
- Prophase 2 of meiosis
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- Genetically modified crops have
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- Genetically modified food
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