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Week 16 Journal Question. Thursday Q: Explain how a person get’s their full set of chromosomes. . Table of Contents . Notes: Genetics. Mendel’s Laws A. Law of Segregation- 1. During meiosis, the genes that control each trait separate .

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week 16 journal question
Week 16 Journal Question

Thursday

Q: Explain how a person get’s their full set of chromosomes.

slide4
Mendel’s Laws

A. Law of Segregation-

1. During meiosis, the genes that control each trait separate.

2. One gene from each pair is passed to the offspring. Haploids have only 1 of each gene.

3. These genes randomly unite (combine) at fertilization.

b law of independent assortment
B. Law of Independent Assortment

1. The inheritance of one trait is unaffected by the inheritance of another trait.

2. You may get your eye color from mombut hair color from dad.

important vocabulary terms
Important Vocabulary Terms

Phenotype: physical characteristics or traits

Genotype: genes

important vocabulary terms1
Important Vocabulary Terms

Dominant Allele

  • A VERSION OF THE TRAIT THAT IS ALWAYS EXPRESSED.
  • Represented by CAPITAL LETTER
  • R, T, D
important vocabulary terms2
Important Vocabulary Terms

Recessive Allele

  • A VERSION OF THE TRAIT THAT IS ALWAYS MASKED IF PAIRED WITH A DOMINANT ALLELE.
  • Represented by LOWERCASE LETTERs
  • r, t, d
possible combination of alleles
Possible combination of alleles

GENOTYPES:

  • Homozygousdominant (ex: RR, TT, EE)
  • Homozygousrecessive (ex: rr, tt, ee)
  • Heterozygous (ex: Rr, Tt, Ee)

Heterozygous genotypes always express the dominant trait!

example 1
Example 1

Brown eyes (B) are dominant over blue eyes(b) .

What are the 3 possible genotypes?

BB, Bb, bb

What are the phenotypes?

BB-brown

Bb-brown

bb-blue

how to do a punnett square problem
How to Do a Punnett Square Problem
  • Decide on all possible genotypes/phenotypes.
  • Find the genotype of the parents.
  • Do a “Punnett” square to show the possible combinations of genes in the offspring.
example genetic problem
Example Genetic Problem

Straight thumb (T) is dominant to hitchhiker’s thumb. If Brenda, who is heterozygous for this trait had children with Jason who is homozygous recessive, what is the chance that their children will be able to hitchhike correctly?

slide14

Straight thumb (T) is dominant to hitchhiker’s thumb. If Brenda, who is heterozygous for this trait had children with Jason who is homozygous recessive, what is the chance that their children will be able to hitchhike correctly?

  • What are all possible genotypes/ phenotypes?
  • TT- Straight thumb
  • Tt- Straight thumb
  • tt- hitchhiker’s thumb
slide15

Straight thumb (T) is dominant to hitchhiker’s thumb. If Brenda, who is heterozygous for this trait had children with Jason who is homozygous recessive, what is the chance that their children will be able to hitchhike correctly?

2. Find the genotype of the parents.

BrendaTt

Jason tt

slide16

Straight thumb (T) is dominant to hitchhiker’s thumb. If Brenda, who is heterozygous for this trait had children with Jason who is homozygous recessive, what is the chance that their children will be able to hitchhike correctly?

3. Do a Punnett square to show the possible combinations of genes in the offspring.

Mother Tt

T

t

t

Father

tt

Tt

tt

tt

Tt

t

slide17

Straight thumb (T) is dominant to hitchhiker’s thumb. If Brenda, who is heterozygous for this trait had children with Jason who is homozygous recessive, what is the chance that their children will be able to hitchhike correctly?

Tt- straight thumb

Tt- hitchhiker’s thumb

2/4= 50%

slide18

Having freckles (F) is dominant over not having freckles (f). A woman who is heterozygous marries a man who is homozygous recessive. What are the chances of their children having freckles?

1.

2.

3.