Genetics Review

Definitions

100

An observable, physical characteristic

Phenotype

200

Specifies what form the gene will take

Allele

300

What is the difference between dominant and recessive

Dominant will show over recessive

400

What are the 3 combinations of alleles that make up genotypes

BB

Bb

bb

500

Contains genetic information of an organism

DNA

Probability %

100

Both parents are heterozygous for brown hair. What is the probability that their offspring will have blonde hair.

25 %

200

Both parents are homozygous recessive for blonde hair. What is the probability that their offspring will have brown hair

0 %

300

Black eyes in monsters are dominant over Blue eyes. Both parents are heterozygous, what is the probability their offspring will have Black eyes

75%

400

Both parents are heterozygous for big ears What is the probability that their offspring will carry the gene for small ears

75%

500

What does the entire Punnett Square represent

The probability of offspring phenotype and genotype

Draw the Punnett Square

100

Dad is homozygous dominant

Mom is homozygous recessive

                 B                  B

         b           Bb        Bb          

          b          Bb        Bb

200

Use the letters F or f

Dad is homozygous dominant for freckles

Mom is heterozygous for freckles

              F               F

     F        FF         FF

       f      Ff          Ff

300

Blacks eyes (B)

Red eyes (b)

Make a cross between two heterozygous rats

          B            b

   B       BB        Bb

    b      Bb         bb

400

Red chest (R)

White chest (r)

Make a cross between a pure recessive and a heterozygous

          R               r

r          Rr          rr

r          Rr          rr

500

Use H or h

Dad is pure homozygous dominant

Mom is pure homozygous recessive

          H            H

h          Hh    Hh

h          Hh    Hh

What are the Parents??

100

Offspring have a 100% probability of being recessive for blue eyes

Both parents are homozygous recessive: bb

200

There is only 25% probability that the offspring will have blue eyes.

Both parents are heterozygous: Bb

300

There is only 25% probability that the offspring will be homozygous dominant

Both parents are heterozygous: Bb

400

100% of the offspring are pure dominant for brown eyes.

Both parents are homozygous dominant: BB

500

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Random

100

Each square in the Punnett Square equals how much percent

25 %

200

If Ms. Boyd won the lotto what would she build

A home library

300

What did Ms. Boyd do over Thanksgiving break

Read a book!

400

Ms. Boyd's favorite type of cookie

Chocolate Chip

500

Ms. Boyd's favorite bar of candy

Twix