Gametes and genotypes simple formula for exam

Gametes are reproductive cells (sex cells) that unite during sexual reproduction to form a new cell called a zygote. In humans, male gametes are sperm and female gametes are ova (eggs). Sperm are motile and have a long, tail-like projection called a flagellum. Ova however, are non-motile and relatively large in comparison to the male gamete.
Gametes are produced by a type of cell division called meiosis. They are haploid, meaning that they contain only one set of chromosomes. When the haploid male and female gametes unite in a process called fertilization, they form what is called a zygote. The zygote is diploid and contains two sets of chromosomes.

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What will be for TTRr
Since there is one heterozygous so 2^1=2 gametes
But actually this is 4 ,why?

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May I know why can't I use Punnett Square to determine the genotype in these scenarios? Thanks!

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Why do we ignore the homozygous once..

[@GeneticsLessons]

The do not produce any variation. What variation you can get from AABBCC or AAbbCC or aabbcc?

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Very well explained but what if all the alleles are homozygous?

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@@GeneticsLessons ummm ya.. it would give only 1gamete

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[@suiren5272]

Hi, why do we ignore the homozygous dominant and recessive alleles?

[@GeneticsLessons]

Because they do not add anything to variation AA produce only one variant A any number multiplied by 1 is the same number.
And for instance genotype AAbbCCddEE only can produce one variant of the game's AbCdE. Only heterozygous loci add to the gametes variation.

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How can i find no of possible genotype of a cross
Punet square takes a long time

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How do you know when to use 3^n?

[@GeneticsLessons]

If you have 3 heterozygous loci fo example AaBBCCddEeFf

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What would be gametes from FfGg if anaphase 1 didnt seperate chromosomes?

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why do we ignore the homozygous

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Are the homozygous recessive and dominant are not belong in doing fork line method? just the heterozygous?

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