Genetic Inheritance
Type 1 good thing that happened over break or one thing you're looking forward to :)
What do you know about genes or genetics?
Genetics Warmup
Type the answer to ONE QUESTION in the chat.
Match q# with word
Example: #7 is dominant.
Fertilization
Write 2 things I learned about Fertilization:
Fertilization is the process of when a __________ and a are combined to make a ___________.
SPERM
EGG
ZYGOTE
Somatic vs. Gamete Cells
Your somatic (body) cells have 46 chromosomes in total (diploid)
Your gametes (sex cells) have 23 chromosomes (haploid)
You get 23 chromosomes from mom, 23 from dad. = 46 in total
GAMETES:
Meiosis makes Gametes
During meiosis, a single cell divides to make daughter cells.
Homologous chromosomes (the chromosomes from mom and dad) experience where they exchange pieces. This genetic diversity
At the end of meiosis four gametes are made .
Genetics PPT
https://docs.google.com/presentation/d/1gP9Yx9b1EOMZD4keoUNtA0AT-QqmEBOYQU3zf-IE7yA/edit?usp=sharing
https://drive.google.com/file/d/1XXP7NoQ8nOPeIUWeBxM6PUle3x-vCY-n/view?usp=sharing
Vocab Word | Definition | Example |
Allele | | |
Dominant | | |
Recessive | | |
Homozygous | | |
Heterozygous | | |
Genotype | | |
Phenotype | | |
Physical characteristic of a trait
Genes (2 alleles) that makeup a trait
1 version of a gene for a trait (a letter)
2 identical alleles for the same trait
Allele will always be expressed (uppercase)
Need 2 alleles to express this (lowercase)
2 different alleles for the same trait
Bb
BB or bb
b
B
BB, Bb, or bb
Monohybrid Punnett Practice #1
Two guinea pigs heterozygous for the hairy trait sexually reproduce with each other. Hairy (H) guinea pigs are dominant to hairless (h)
What are the genotypes of the two parents? __Hh_____& _______
Place parent genotypes in the colored boxes. Then, fill in what the offspring genotypes would be.
Bonus: what are the odds that the resulting offspring will be hairy?
¾ = 75%
Hairless: 25% = ¼
👫 | H | h |
H | HH | Hh |
h | Hh | hh |
Possible parent genotypes
hh
Hh
HH
Monohybrid Punnett Answer Key
Check the key. Did you get the previous question right?
Monohybrid Punnett Practice #2
A hairless guinea pig and a hairy guinea pig with a heterozygous genotype breed. Hairy (H) guinea pigs are dominant to hairless (h)
What are the genotypes of the two parents? ____hh___& ___Hh____
Place parent genotypes in the colored boxes. Then, fill in what the offspring genotypes would be.
Bonus: what is the probability that they will produce hairless offspring? 2/4 = 50%
👫 | h | h |
H | Hh | Hh |
h | hh | hh |
Possible parent genotypes
hh
Hh
HH
Monohybrid Punnett Answer Key
Check the key. Did you get the previous question right?