Slide 14 - Embryology

Slide 14 - Embryology - You can press T to confirm that you...

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You can press “T” to confirm that you have registered, if you want. Today: Embryology
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Midterm examination: Monday, Feb. 22, 6:30 PM, in Hasbrouck 20. Review Test cross Alleles (multiple alleles), loci Polygenic inheritance Genetic load, inbreeding X-linked inheritance, autosomes
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Review how to solve a X-linked inheritance problem First, write a Punnet Square for the X and Y chromosomes. X Y X Y X X X X X X X X X Y X Y Next, add the genes onto the chromosomes as superscripts. h h h H H H H H H H h H
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In fruit flies and certain other species, sex is determined by X and Y chromosomes, as in mammals. In other species, there are different mechanisms of sex determination.
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Chromosomal mechanisms Chickens reverse the pattern of mammals. Hens have the special sex chromosome.
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Social sex determination There is one male and a group of females. (An hierarchical group of females.) When the male is removed, the dominant female becomes a male.
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determines sex of hatchlings. Warm nests hatch out females.
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Slide 14 - Embryology - You can press T to confirm that you...

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