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LH. Biology Heredity Benchmark 1. Explain how characteristics of living things are passed on from generation to generation. Being Able to Curl up both sides of the Tongue is under the control of a dominant allele at one gene locus . Homozygous Dominant. RR Rr. rr. Homozygous recessive.

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slide1

LH. Biology HeredityBenchmark 1

Explain how characteristics of living things are

passed on from generation to generation.

slide2

Being Able to Curl up both sides of the

Tongue is under the control of a dominant

allele atone gene locus.

Homozygous Dominant

RR

Rr

rr

Homozygous recessive

Heterozygous

inheritance for tongue rolling and non tongue rolling
Inheritance for Tongue Rolling and Non-tongue Rolling

Susan’s mom is a tongue roller. Her father is a

non-tongue roller. Susan has three older

brothers and one younger sister. Her three

brothers are all tongue rollers. Her sister is

a non-roller.What are the genotypes of each

member of Susan’s family?

R = allele for ability to roll the tongue

r = allele for non-roller

what are susan s family tongue rolling genotypes
What are Susan’s Family Tongue Rolling Genotypes?

Dad = rr (non-roller, recessive trait expressed)

Sister = rr (non-roller, recessive expressed)

Mom = Rr (heterozygous, mom had to donate

the “r” allele to Susan’s sister and since mom is

a roller she must have the “R” allele)

Susan and her brothers = Rr (heterozygous, each

child inherits an “r” allele from dad and because

they can roll they each inherited an “R” allele

from mom)

mark marries susan
Mark marries Susan. . .

Mark’s mom is a non-roller and his dad is a

roller. Mark’s two brothers are rollers.

What is Mark’s genotype for ability to

roll the tongue?

Rr

Mark and Susan are planning a family. What is

the probability that Susan will deliver a

roller, a non-roller?

slide6

Punnett Square

Mark

R

r

S

u

s

a

n

R

Roller

R

R

Roller

R

r

Roller

R

r

Non Roller

r

r

r

Genotypic Ratio 1:2:1

Phenotypic Ratio 3:1

slide7

After fourteen years of marriage...

…are all happy ROLLERS !!!

Susan

Mark

Ashley

Jessica

slide8

BabyPeas Don’t Go

Gregor Mendel

Father of Heredity

Baby Peas Don’t Go

slide9

Look, the

Structure

of DNA!

Crick

DNA Model

1953

Watson

slide10

Family Tree

r r

r r

R r

Rr

If Mary and Peter

are both Rollers, what

are the chances for

Anne to be roller,

a non-roller ?

slide11

Key Concepts

Traits

Dominant

Recessive

Genetic material

gene pair

gene combination

gene sorting

slide12

Real-world contexts

Common contexts

Inheritance of a human genetic disease/disorder, such as sickle cell anemia

A family tree focused on certain traits

Examining animal or plant pedigrees.

slide15

A particular species of bird can be brown or white.

The white color is a recessive trait,

while the brown color is a dominant trait.

When two brown birds mate,

is it possible for them to have white offspring?

  • no because both parents have
  • only genes for being brown
  • yes, because offspring color
  • does not depend on the genes of the parents
  • yes, because both parents
  • have and pass on the gene for being white
  • no, because the parents can only
  • pass on the dominant gene to their offspring.
slide16

a. no because both parents have only genes for being brown

Incorrect: You don’t know for sure if both parents

have two genes for being brown (BB).

They could have a Brown gene and

a white gene (Bb) and still have the

phenotype (what they look like) of white color

Return to the question

slide17

b. yes, because offspring color does not depend on the genes of the parents

Incorrect: The color does depend on their genes. This is an inherited trait.

Return to the question

slide18

You Pass

with

Flying Colors

c. yes, because both parents have and pass on the gene for being white

Correct: You don’t know for sure if both parents

have two genes for being brown (BB).

They could have a Brown gene and

a white gene (Bb) and still have the

phenotype (what they look like) of white color

Return to the question

slide19

no, because the parents can only pass on the dominant gene to their offspring.

  • Incorrect: They have an equal chance of passing on the dominant and recessive gene if the contain both. The term dominant means that when an individual has two different genes for a trait the dominant is the one that shows up in the phenotype (appearance)

Return to the question