23/24 Genetics Unit 4 Exam prep - Lectures 1 and 2

Organize the following into the correct category

Groups:

(a) Meiosis I

,

(b) Meiosis II

• no homologous pairs of chromosomes

• no cross-over

• chromosomes separated

• homologous pairs will pair up

• cross-over for genetic variation

• produces 2 cells

• sister chromotids are separated

• produces 4 cells

• No interphase prior to prophase

• interphase happens prior to prophase

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NGSS.HS-LS3-2

This process is called ​ (a)   and occurs during ​ (b)   . This process is beneficial because it causes ​ (c)   .

• crossing over
• Prophase I
• genetic variation
• twisting
• Prophase II
• Interphase I
• Meiosis

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NGSS.HS-LS3-2

This pair of ​ (a)   forms a "4 legged" structure called a ​ (b)   .

• homologous chromosomes
• tetrad
• ditrad
• homologous sister chromotids

Organize these statements into the right categories

Groups:

(a) Prophase I

,

(b) Metaphase I

,

(c) Anaphase I/Telophase I

• 
• Tetrads pair up

• 
• Homologous chromosomes separate

• 
• 
• Tetrads align on the equitorial plate of the cell

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NGSS.HS-LS1-4

End result of Meiosis I vs End Result of Meiosis II

Groups:

(a) Meiosis I

,

(b) Meiosis II

• 4 genetically different daughter cells

• 2 genetically different daughter cells

• 
• 

Alleles (example: H or h) are alternative forms of a gene. How many alleles does a baby guinea pig inherit from their mother?

• 1

• 2

• 23

• whichever one is dominant

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NGSS.HS-LS3-1

A HETEROZYGOUS individual would have the genotype:

• Hh

• hh

• HH

• Hi

In humans, blue eyes are a recessive trait. What genotype would a blue eyed child have?

• BB

• Bb

• bb

• None of the above, brown eyes are dominant.

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

In pea plants, tall (T) plant alleles are dominant to short (t) plant alleles. If two tall plants (each with the genotype Tt) are crossed, what is the probability that the cross would result in a short pea plant?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Brown eyes (B) are dominant to blue eyes (b). Determine the phenotype for a child with the genotype - Bb

(a)  

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NGSS.HS-LS3-1