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12.6_6thSci_TR 4.1

Last updated almost 3 years ago
16 questions
Objective and Slides
KWBAT identify dominant and recessive genes and predict which traits will be visible based on gene versions.
Part 1

Part 1: Do Now

The image below shows three spiders who have different gene versions for silk stickiness. Use what is given to answer your warm up questions!

1

Which gene version seems to cause stickiness: S1 or S2?

1

Which gene version seems to cause silk to not be sticky: S1 or S2?

0

Spider A and Spider B have identical traits (Sticky Silk). The spiders do not have the same parents but they have identical traits. How is it possible that they can have the same traits even if they do not have the same parents?

CFS:
*Passing of genes, random or selected?
*How are gene combinations determined?
*Are Gene combinations always the same?

1

Which spider(s) has a homozygous gene version?

Spider A = S1S1
Spider B = S1S2
Spider C = S2S2

1

Which spider(s) has a heterozygous gene version?

Spider A = S1S1
Spider B = S1S2
Spider C = S2S2

Part 2

Part 2: Introduction to Dominant and Recessive Traits

1

Summarize: if an organism has a dominant gene version and a recessive gene version for a particular trait, which one will be visible?

1

Summarize: if an organism has only a recessive gene version for a particular trait, which one will be visible?

1

A = red color
a = blue color

If A is dominant, and a is recessive, which gene combinations will result in red colors?

CFS:
*What makes it dominant or recessive?
*Homozygous dominant/homozygous recessive or heterozygous?

Select all that apply.

1

A = red color
a = blue color

If A is dominant, and a is recessive, which gene combinations will result in blue colors?

CFS:
*What makes it dominant or recessive?
*Homozygous dominant/homozygous recessive or heterozygous?

Part 3

Part 3: Dominant and Recessive Genes Practice

2

Identify the following combinations of gene versions as heterozygous or homozygous. Then, decide which trait would show up (the first row is done for you).

CFS:
*What makes it dominant or recessive?
*Homozygous dominant/homozygous recessive or heterozygous?


0

An individual with the gene version “Yy” would have a yellow body; why wouldn’t they have a blue body?

CFS:
*Did I use the table to review the genotypes and phenotypes?
*What makes a color show?

Part 4

Part 4: Exit Ticket


1

Look back at the do now. Which gene version is recessive: S1 or S2? Explain how you know.

1

Identify if the gene version is heterozygous or homozygous, then decide which trait would show up (dominant or recessive)

Gene Version = TT

1

Identify if the gene version is heterozygous or homozygous, then decide which trait would show up (dominant or recessive)

Gene Version = cc

1

Identify if the gene version is heterozygous or homozygous, then decide which trait would show up (dominant or recessive)

Gene Version = Bb

1

Identify if the gene version is heterozygous or homozygous, then decide which trait would show up (dominant or recessive)

Gene Version = Aa

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