Genetics buzzwords
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Phenotype. Genotype. physical appearance of an organism. the set of genes (alleles) that an organism possesses. Homozygous. Heterozygous. when two alleles (gene types) are identical. when the two alleles are different. Genetics Buzzwords. Allele. different forms of the same gene.

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Genetics Buzzwords

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Genetics buzzwords

Phenotype

Genotype

physical appearance of an organism.

the set of genes (alleles) that an organism possesses

Homozygous

Heterozygous

when two alleles (gene types) are identical

when the two alleles are different

Genetics Buzzwords

Allele

different forms of the same gene


Genetics buzzwords

Dominant

allele which controls the characteristic whenever it is present.

BB or Bb

recessive

allele whose characteristics only show up when it is present on both chromosomes

bb


Determining characteristics

Determining characteristics

In pea plants, tallness (T) is dominant to dwarfness (t)

A tall pea plant could have a genotype of:

TT

Tt

Both combinations have the same phenotype- tall.

homozygous dominant

heterozygous

A dwarf pea plant could only have the genotypett Phenotype- dwarf.

homozygous recessive


Gene combinations

Gene combinations

The simplest genetic cross involves one characteristic and is called a monohybrid cross.

In this the parents (P) are crossed (bred) with each other, and the offspring (F1 generation) observed and counted.

Follow the procedure on the board!!


Genetics buzzwords

Mother

XX

Father

XY

X

X

X

Y

XX

XY

XX

XY

gametes

1:1 ratio male to female offspring

Offspring: Male or female?

F

M

F

M

This explains how the sex of a child is determined by X and Y chromosomes.

This can also be shown and combinations worked out using a Punnett square:


Genetics buzzwords

Task

1. Complete the problems in the Monohybrid Crosses booklet

  • DO NOT SKIP STEPS!!

  • Always define the alleles

  • Always draw the Punnet square

    2. Let´s play Traits Bingo! (15 min)


Keywords review

Keywords review

  • Can you match up the key words to the definitions?

  • You only have 4 min before the bomb goes off!


Starter get your brains in gear no notes

STARTER: Get your brains in gear!NO NOTES!!!

A – normal skin pigmentation

a – albino

What percentage chance is there of producing a child with albinism?


Tasks this lesson

Tasks this lesson

1: Finish the Monohybrid Crosses revision booklet (15 min)

2: Try the problems in the More Monohybrid crosses booklet! (20 min)

3: Let’s play Traits bingo! (15 min)


Starter

STARTER

Who is known as “the man of 1000 peas?”

How long has he been running his experiments for?

How many plants did he grow?

What did he notice when he first grew pea plants?

What field of biology has come about because of his experimenting on peas?


Tasks this lesson1

Tasks this lesson

  • Finish the More Monohybrid Crosses booklet

  • Attempt the past paper questions (put the theory into practice!)

  • Finish the lyrics!


Tasks this lesson2

Tasks this lesson

  • Have a go at the past paper question booklet

  • Read the Mendel´s Laws booklet and answer the questions

  • The genetics of skin colour TED talk


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